TY  - CONF
AU  - Pergal, Marija
AU  - Rašljić-Rafajilović, Milena
AU  - Vićentić, Teodora
AU  - Mladenović, Ivana
AU  - Ostojić, Sanja
AU  - Spasenović, Marko
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6740
AB  - Laser-induced graphene (LIG) has recently been proposed as a viable option for fabricating
various types of flexible electronic devices due to its excellent mechanical stability and
electrical properties. During laser induction of graphene on polymers, the high temperature
generated with the laser breaks C-O, C=O, and N-C bonds in polymers, leading to the
recombination of C and N atoms. Additionally, the rapid release of carbonaceous and nitric gases results in the formation of 3D porous structures. This approach offers a one-step,
chemical-free synthesis method for producing porous graphene on polymer surfaces.
Moreover, it is a fast and cost-effective technique that is ideal for flexible electronics and
energy storage devices. In this study, graphene was formed on a poly(dimethylsiloxane)
(PDMS)/Triton substrate with varying concentrations of Triton (1-30 wt.%) using CO2 laser
irradiation. The effects of Triton content on the structural, thermal, and surface characteristics
of PDMS/Triton and PDMS/Triton/graphene materials were investigated. The prepared
PDMS/Triton/graphene materials were thoroughly examined using X-ray diffraction analysis
(XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and
water contact angle analysis. XRD analysis confirmed the presence of graphene in the
material. The thermal and surface properties of the proposed materials can be easily adjusted
by manipulating the Triton concentration. The hydrophilicity of the prepared PDMS/Triton
materials increased compared to pure PDMS, which is hydrophobic. It was found that the
success of LIG formation depends on Triton content, increasing with higher concentration of
Triton in the PDMS matrix. The presented results aim to address the existing challenges
associated with stretchable polymers suitable for flexible electronic device applications.
PB  - Serbian Ceramic Society
C3  - Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia
T1  - Structural and thermal properties of PDMS/Triton/laser-induced graphene composites
SP  - 59
EP  - 60
UR  - https://hdl.handle.net/21.15107/rcub_cer_6740
ER  - 

@conference{
author = "Pergal, Marija and Rašljić-Rafajilović, Milena and Vićentić, Teodora and Mladenović, Ivana and Ostojić, Sanja and Spasenović, Marko",
year = "2023",
abstract = "Laser-induced graphene (LIG) has recently been proposed as a viable option for fabricating
various types of flexible electronic devices due to its excellent mechanical stability and
electrical properties. During laser induction of graphene on polymers, the high temperature
generated with the laser breaks C-O, C=O, and N-C bonds in polymers, leading to the
recombination of C and N atoms. Additionally, the rapid release of carbonaceous and nitric gases results in the formation of 3D porous structures. This approach offers a one-step,
chemical-free synthesis method for producing porous graphene on polymer surfaces.
Moreover, it is a fast and cost-effective technique that is ideal for flexible electronics and
energy storage devices. In this study, graphene was formed on a poly(dimethylsiloxane)
(PDMS)/Triton substrate with varying concentrations of Triton (1-30 wt.%) using CO2 laser
irradiation. The effects of Triton content on the structural, thermal, and surface characteristics
of PDMS/Triton and PDMS/Triton/graphene materials were investigated. The prepared
PDMS/Triton/graphene materials were thoroughly examined using X-ray diffraction analysis
(XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and
water contact angle analysis. XRD analysis confirmed the presence of graphene in the
material. The thermal and surface properties of the proposed materials can be easily adjusted
by manipulating the Triton concentration. The hydrophilicity of the prepared PDMS/Triton
materials increased compared to pure PDMS, which is hydrophobic. It was found that the
success of LIG formation depends on Triton content, increasing with higher concentration of
Triton in the PDMS matrix. The presented results aim to address the existing challenges
associated with stretchable polymers suitable for flexible electronic device applications.",
publisher = "Serbian Ceramic Society",
journal = "Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia",
title = "Structural and thermal properties of PDMS/Triton/laser-induced graphene composites",
pages = "59-60",
url = "https://hdl.handle.net/21.15107/rcub_cer_6740"
}

Pergal, M., Rašljić-Rafajilović, M., Vićentić, T., Mladenović, I., Ostojić, S.,& Spasenović, M.. (2023). Structural and thermal properties of PDMS/Triton/laser-induced graphene composites. in Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia
Serbian Ceramic Society., 59-60.
https://hdl.handle.net/21.15107/rcub_cer_6740

Pergal M, Rašljić-Rafajilović M, Vićentić T, Mladenović I, Ostojić S, Spasenović M. Structural and thermal properties of PDMS/Triton/laser-induced graphene composites. in Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia. 2023;:59-60.
https://hdl.handle.net/21.15107/rcub_cer_6740 .

Pergal, Marija, Rašljić-Rafajilović, Milena, Vićentić, Teodora, Mladenović, Ivana, Ostojić, Sanja, Spasenović, Marko, "Structural and thermal properties of PDMS/Triton/laser-induced graphene composites" in Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia (2023):59-60,
https://hdl.handle.net/21.15107/rcub_cer_6740 .

TY  - CONF
AU  - Pergal, Marija
AU  - Rašljić Rafajilović, Milena
AU  - Vićentić, Teodora
AU  - Pašti, Igor
AU  - Bajuk-Bogdanović, Danica
AU  - Radulović, Katarina
AU  - Spasenović, Marko
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7114
AB  - Laser-induced graphene (LIG) has emerged as one of the most promising materials for
flexible functional devices. One-step fabrication of LIG offers advantages such as low cost,
patterning of desired geometries, and high sensitivity. However, previous attempts to obtain
LIG on elastomeric substrates have been unsuccessful, limiting its potential for use in
stretchable electronics. In this study, we propose using a substrate composed of
polydimethylsiloxane (PDMS) and poly(ethylene oxide) (PEO) with a low molecular weight
as a platform for manufacturing LIG. A series of PDMS/PEO materials with varying
concentrations of PEO (1, 5, 10, 20, 30, 40 and 50 wt.%) were prepared using a cast-based
approach, starting from divinyl-terminated-PDMS and poly(methyl-hydrogensiloxane). The
prepared PDMS/PEO/graphene composites were characterized using Raman spectroscopy,
Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM)
analysis. FTIR analysis confirmed the structure of the prepared PDMS/PEO and
PDMS/PEO/graphene materials. The results demonstrated that the prepared PDMS/PEO
composites exhibited a higher degree of graphenization compared to pure PDMS networks.
SEM analysis revealed the formation of a porous graphene structure. Based on these findings,
the PDMS/PEO/graphene composites show promise for further investigation as electronic
device applications.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia
T1  - Laser-induced graphene on PEO/PDMS composites
SP  - 59
EP  - 59
UR  - https://hdl.handle.net/21.15107/rcub_cer_7114
ER  - 

@conference{
author = "Pergal, Marija and Rašljić Rafajilović, Milena and Vićentić, Teodora and Pašti, Igor and Bajuk-Bogdanović, Danica and Radulović, Katarina and Spasenović, Marko",
year = "2023",
abstract = "Laser-induced graphene (LIG) has emerged as one of the most promising materials for
flexible functional devices. One-step fabrication of LIG offers advantages such as low cost,
patterning of desired geometries, and high sensitivity. However, previous attempts to obtain
LIG on elastomeric substrates have been unsuccessful, limiting its potential for use in
stretchable electronics. In this study, we propose using a substrate composed of
polydimethylsiloxane (PDMS) and poly(ethylene oxide) (PEO) with a low molecular weight
as a platform for manufacturing LIG. A series of PDMS/PEO materials with varying
concentrations of PEO (1, 5, 10, 20, 30, 40 and 50 wt.%) were prepared using a cast-based
approach, starting from divinyl-terminated-PDMS and poly(methyl-hydrogensiloxane). The
prepared PDMS/PEO/graphene composites were characterized using Raman spectroscopy,
Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM)
analysis. FTIR analysis confirmed the structure of the prepared PDMS/PEO and
PDMS/PEO/graphene materials. The results demonstrated that the prepared PDMS/PEO
composites exhibited a higher degree of graphenization compared to pure PDMS networks.
SEM analysis revealed the formation of a porous graphene structure. Based on these findings,
the PDMS/PEO/graphene composites show promise for further investigation as electronic
device applications.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia",
title = "Laser-induced graphene on PEO/PDMS composites",
pages = "59-59",
url = "https://hdl.handle.net/21.15107/rcub_cer_7114"
}

Pergal, M., Rašljić Rafajilović, M., Vićentić, T., Pašti, I., Bajuk-Bogdanović, D., Radulović, K.,& Spasenović, M.. (2023). Laser-induced graphene on PEO/PDMS composites. in Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia
Belgrade : Serbian Ceramic Society., 59-59.
https://hdl.handle.net/21.15107/rcub_cer_7114

Pergal M, Rašljić Rafajilović M, Vićentić T, Pašti I, Bajuk-Bogdanović D, Radulović K, Spasenović M. Laser-induced graphene on PEO/PDMS composites. in Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia. 2023;:59-59.
https://hdl.handle.net/21.15107/rcub_cer_7114 .

Pergal, Marija, Rašljić Rafajilović, Milena, Vićentić, Teodora, Pašti, Igor, Bajuk-Bogdanović, Danica, Radulović, Katarina, Spasenović, Marko, "Laser-induced graphene on PEO/PDMS composites" in Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia (2023):59-59,
https://hdl.handle.net/21.15107/rcub_cer_7114 .

TY  - CONF
AU  - Rašljić Rafajilović, Milena
AU  - Vićentić, Teodora
AU  - Spasenović, Marko
AU  - Bajuk-Bogdanović, Danica
AU  - Pašti, Igor
AU  - Radulović, Katarina
AU  - Pergal, Marija
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7115
AB  - The objective of this study was to develop optimal laser parameters (resolution, power, and velocity) for the formation of graphene on poly(dimethylsiloxane) (PDMS)-based materials using laser-induced graphene (LIG). A series of novel PDMS/poly(ethylene glycol) (PEG) materials with varying concentrations of PEG (30, 40, and 50 wt.%) was prepared through a blending approach. For comparison, pure PDMS was prepared using a casting method. To the best of our knowledge, the synthesis of PDMS/PEG materials and the direct laser graphenization (LIG) of PDMS/PEG materials have not been reported in the literature. Once the optimal laser parameters were established, the prepared PDMS/PEG/graphene composites were characterized using Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and scanning electron microscopy (SEM). The results demonstrated that the addition of PEG led to an enhanced degree of graphenization compared to the pure PDMS sample, which did not induce graphene formation. Among the materials tested, the PDMS/PEG/graphene composite with 30 wt.% PEG in the PDMS matrix exhibited the optimal degree of graphenization. SEM analysis of the LIG on PDMS/PEG material revealed a porous network structure. With their improved properties, the developed PDMS/PEG/graphene composites hold promise as materials suitable for the production of flexible electronic devices.
PB  - Академија наука и умјетности Републике Српске / Academy of Sciences and Arts of the Republic of Srpska
C3  - XVI Mеђународни научни скуп Савремени материјали 2023, Програм рада и Књига апстраката, 7 - 8. септембар 2023. године, Бања Лука /XVI International Scientific Conference Contemporary Materials 2023, Programme and the Book Of Abstracts, September 7 - 8, 2023, Banja Luka
T1  - Optimal laser parameters for laser induction of graphene on poly(dimethylsiloxane)-based materials
SP  - 40
EP  - 40
UR  - https://hdl.handle.net/21.15107/rcub_cer_7115
ER  - 

@conference{
author = "Rašljić Rafajilović, Milena and Vićentić, Teodora and Spasenović, Marko and Bajuk-Bogdanović, Danica and Pašti, Igor and Radulović, Katarina and Pergal, Marija",
year = "2023",
abstract = "The objective of this study was to develop optimal laser parameters (resolution, power, and velocity) for the formation of graphene on poly(dimethylsiloxane) (PDMS)-based materials using laser-induced graphene (LIG). A series of novel PDMS/poly(ethylene glycol) (PEG) materials with varying concentrations of PEG (30, 40, and 50 wt.%) was prepared through a blending approach. For comparison, pure PDMS was prepared using a casting method. To the best of our knowledge, the synthesis of PDMS/PEG materials and the direct laser graphenization (LIG) of PDMS/PEG materials have not been reported in the literature. Once the optimal laser parameters were established, the prepared PDMS/PEG/graphene composites were characterized using Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and scanning electron microscopy (SEM). The results demonstrated that the addition of PEG led to an enhanced degree of graphenization compared to the pure PDMS sample, which did not induce graphene formation. Among the materials tested, the PDMS/PEG/graphene composite with 30 wt.% PEG in the PDMS matrix exhibited the optimal degree of graphenization. SEM analysis of the LIG on PDMS/PEG material revealed a porous network structure. With their improved properties, the developed PDMS/PEG/graphene composites hold promise as materials suitable for the production of flexible electronic devices.",
publisher = "Академија наука и умјетности Републике Српске / Academy of Sciences and Arts of the Republic of Srpska",
journal = "XVI Mеђународни научни скуп Савремени материјали 2023, Програм рада и Књига апстраката, 7 - 8. септембар 2023. године, Бања Лука /XVI International Scientific Conference Contemporary Materials 2023, Programme and the Book Of Abstracts, September 7 - 8, 2023, Banja Luka",
title = "Optimal laser parameters for laser induction of graphene on poly(dimethylsiloxane)-based materials",
pages = "40-40",
url = "https://hdl.handle.net/21.15107/rcub_cer_7115"
}

Rašljić Rafajilović, M., Vićentić, T., Spasenović, M., Bajuk-Bogdanović, D., Pašti, I., Radulović, K.,& Pergal, M.. (2023). Optimal laser parameters for laser induction of graphene on poly(dimethylsiloxane)-based materials. in XVI Mеђународни научни скуп Савремени материјали 2023, Програм рада и Књига апстраката, 7 - 8. септембар 2023. године, Бања Лука /XVI International Scientific Conference Contemporary Materials 2023, Programme and the Book Of Abstracts, September 7 - 8, 2023, Banja Luka
Академија наука и умјетности Републике Српске / Academy of Sciences and Arts of the Republic of Srpska., 40-40.
https://hdl.handle.net/21.15107/rcub_cer_7115

Rašljić Rafajilović M, Vićentić T, Spasenović M, Bajuk-Bogdanović D, Pašti I, Radulović K, Pergal M. Optimal laser parameters for laser induction of graphene on poly(dimethylsiloxane)-based materials. in XVI Mеђународни научни скуп Савремени материјали 2023, Програм рада и Књига апстраката, 7 - 8. септембар 2023. године, Бања Лука /XVI International Scientific Conference Contemporary Materials 2023, Programme and the Book Of Abstracts, September 7 - 8, 2023, Banja Luka. 2023;:40-40.
https://hdl.handle.net/21.15107/rcub_cer_7115 .

Rašljić Rafajilović, Milena, Vićentić, Teodora, Spasenović, Marko, Bajuk-Bogdanović, Danica, Pašti, Igor, Radulović, Katarina, Pergal, Marija, "Optimal laser parameters for laser induction of graphene on poly(dimethylsiloxane)-based materials" in XVI Mеђународни научни скуп Савремени материјали 2023, Програм рада и Књига апстраката, 7 - 8. септембар 2023. године, Бања Лука /XVI International Scientific Conference Contemporary Materials 2023, Programme and the Book Of Abstracts, September 7 - 8, 2023, Banja Luka (2023):40-40,
https://hdl.handle.net/21.15107/rcub_cer_7115 .

TY  - JOUR
AU  - Vićentić, Teodora
AU  - Greco, Immacolata
AU  - Iorio, Carlo Saverio
AU  - Mišković, Vanja
AU  - Bajuk-Bogdanović, Danica
AU  - Pašti, Igor
AU  - Radulović, Katarina
AU  - Klenk, S.
AU  - Stimpel-Lindner, Tanja
AU  - Duesberg, G. S.
AU  - Spasenović, Marko
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7416
AB  - Laser-induced graphene (LIG) possesses desirable properties for numerous applications. However, LIG formation on biocompatible substrates is needed to further augment the integration of LIG-based technologies into nanobiotechnology. Here, LIG formation on cross-linked sodium alginate is reported. The LIG is systematically investigated, providing a comprehensive understanding of the physicochemical characteristics of the material. Raman spectroscopy, scanning electron microscopy with energy-dispersive x-ray analysis, x-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectroscopy and x-ray photoelectron spectroscopy techniques confirm the successful generation of oxidized graphene on the surface of cross-linked sodium alginate. The influence of laser parameters and the amount of crosslinker incorporated into the alginate substrate is explored, revealing that lower laser speed, higher resolution, and increased CaCl2 content leads to LIG with lower electrical resistance. These findings could have significant implications for the fabrication of LIG on alginate with tailored conductive properties, but they could also play a guiding role for LIG formation on other biocompatible substrates.
PB  - IOP Publishing
T2  - Nanotechnology
T1  - Laser-induced graphene on cross-linked sodium alginate
VL  - 35
IS  - 11
SP  - 115103
DO  - 10.1088/1361-6528/ad143a
ER  - 

@article{
author = "Vićentić, Teodora and Greco, Immacolata and Iorio, Carlo Saverio and Mišković, Vanja and Bajuk-Bogdanović, Danica and Pašti, Igor and Radulović, Katarina and Klenk, S. and Stimpel-Lindner, Tanja and Duesberg, G. S. and Spasenović, Marko",
year = "2023",
abstract = "Laser-induced graphene (LIG) possesses desirable properties for numerous applications. However, LIG formation on biocompatible substrates is needed to further augment the integration of LIG-based technologies into nanobiotechnology. Here, LIG formation on cross-linked sodium alginate is reported. The LIG is systematically investigated, providing a comprehensive understanding of the physicochemical characteristics of the material. Raman spectroscopy, scanning electron microscopy with energy-dispersive x-ray analysis, x-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectroscopy and x-ray photoelectron spectroscopy techniques confirm the successful generation of oxidized graphene on the surface of cross-linked sodium alginate. The influence of laser parameters and the amount of crosslinker incorporated into the alginate substrate is explored, revealing that lower laser speed, higher resolution, and increased CaCl2 content leads to LIG with lower electrical resistance. These findings could have significant implications for the fabrication of LIG on alginate with tailored conductive properties, but they could also play a guiding role for LIG formation on other biocompatible substrates.",
publisher = "IOP Publishing",
journal = "Nanotechnology",
title = "Laser-induced graphene on cross-linked sodium alginate",
volume = "35",
number = "11",
pages = "115103",
doi = "10.1088/1361-6528/ad143a"
}

Vićentić, T., Greco, I., Iorio, C. S., Mišković, V., Bajuk-Bogdanović, D., Pašti, I., Radulović, K., Klenk, S., Stimpel-Lindner, T., Duesberg, G. S.,& Spasenović, M.. (2023). Laser-induced graphene on cross-linked sodium alginate. in Nanotechnology
IOP Publishing., 35(11), 115103.
https://doi.org/10.1088/1361-6528/ad143a

Vićentić T, Greco I, Iorio CS, Mišković V, Bajuk-Bogdanović D, Pašti I, Radulović K, Klenk S, Stimpel-Lindner T, Duesberg GS, Spasenović M. Laser-induced graphene on cross-linked sodium alginate. in Nanotechnology. 2023;35(11):115103.
doi:10.1088/1361-6528/ad143a .

Vićentić, Teodora, Greco, Immacolata, Iorio, Carlo Saverio, Mišković, Vanja, Bajuk-Bogdanović, Danica, Pašti, Igor, Radulović, Katarina, Klenk, S., Stimpel-Lindner, Tanja, Duesberg, G. S., Spasenović, Marko, "Laser-induced graphene on cross-linked sodium alginate" in Nanotechnology, 35, no. 11 (2023):115103,
https://doi.org/10.1088/1361-6528/ad143a . .

TY  - JOUR
AU  - Tomašević-Ilić, Tijana
AU  - Škoro, Nikola
AU  - Jovanović, Đorđe
AU  - Puač, Nevena
AU  - Spasenović, Marko
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7210
AB  - Graphene films prepared from solution and deposited by Langmuir–Blodgett self-assembly technique (LBSA) were treated with radio-frequency (13.56 MHz) nitrogen plasma in order to investigate the influence of the time of nitrogen plasma exposure on the work function, sheet resistance, and surface morphology of LBSA graphene films. Kelvin probe force microscopy and sheet resistance measurements confirm nitrogen functionalization of our films, with the Fermi level shifting in a direction that indicates binding to a pyridinic and/or pyrrolic site. Upon 1 min of nitrogen plasma exposure, the sheet resistance decreases and there is no obvious difference in film morphology. However, plasma exposure longer than 5 min leads to the removal of graphene flakes and degradation of graphene films, in turn, affecting the flake connectivity and increasing film resistance. We show that by changing the exposure time, we can control the work function and decrease sheet resistance, without affecting surface morphology. Controllability of the plasma technique has an advantage for graphene functionalization over conventional doping techniques such as chemical drop-casting. It allows for the controllable tuning of the work function, surface morphology, and sheet resistance of LBSA graphene films, which is substantial for applications in various optoelectronic devices.
PB  - MDPI
T2  - Condensed Matter
T1  - Plasma-Assisted Nitrogen Doping of Langmuir–Blodgett Self-Assembled Graphene Films
VL  - 8
IS  - 2
SP  - 34
DO  - 10.3390/condmat8020034
ER  - 

@article{
author = "Tomašević-Ilić, Tijana and Škoro, Nikola and Jovanović, Đorđe and Puač, Nevena and Spasenović, Marko",
year = "2023",
abstract = "Graphene films prepared from solution and deposited by Langmuir–Blodgett self-assembly technique (LBSA) were treated with radio-frequency (13.56 MHz) nitrogen plasma in order to investigate the influence of the time of nitrogen plasma exposure on the work function, sheet resistance, and surface morphology of LBSA graphene films. Kelvin probe force microscopy and sheet resistance measurements confirm nitrogen functionalization of our films, with the Fermi level shifting in a direction that indicates binding to a pyridinic and/or pyrrolic site. Upon 1 min of nitrogen plasma exposure, the sheet resistance decreases and there is no obvious difference in film morphology. However, plasma exposure longer than 5 min leads to the removal of graphene flakes and degradation of graphene films, in turn, affecting the flake connectivity and increasing film resistance. We show that by changing the exposure time, we can control the work function and decrease sheet resistance, without affecting surface morphology. Controllability of the plasma technique has an advantage for graphene functionalization over conventional doping techniques such as chemical drop-casting. It allows for the controllable tuning of the work function, surface morphology, and sheet resistance of LBSA graphene films, which is substantial for applications in various optoelectronic devices.",
publisher = "MDPI",
journal = "Condensed Matter",
title = "Plasma-Assisted Nitrogen Doping of Langmuir–Blodgett Self-Assembled Graphene Films",
volume = "8",
number = "2",
pages = "34",
doi = "10.3390/condmat8020034"
}

Tomašević-Ilić, T., Škoro, N., Jovanović, Đ., Puač, N.,& Spasenović, M.. (2023). Plasma-Assisted Nitrogen Doping of Langmuir–Blodgett Self-Assembled Graphene Films. in Condensed Matter
MDPI., 8(2), 34.
https://doi.org/10.3390/condmat8020034

Tomašević-Ilić T, Škoro N, Jovanović Đ, Puač N, Spasenović M. Plasma-Assisted Nitrogen Doping of Langmuir–Blodgett Self-Assembled Graphene Films. in Condensed Matter. 2023;8(2):34.
doi:10.3390/condmat8020034 .

Tomašević-Ilić, Tijana, Škoro, Nikola, Jovanović, Đorđe, Puač, Nevena, Spasenović, Marko, "Plasma-Assisted Nitrogen Doping of Langmuir–Blodgett Self-Assembled Graphene Films" in Condensed Matter, 8, no. 2 (2023):34,
https://doi.org/10.3390/condmat8020034 . .

TY  - JOUR
AU  - Baglioni, Gabriele
AU  - Pezone, Roberto
AU  - Vollebregt, Sten
AU  - Cvetanović-Zobenica, Katarina
AU  - Spasenović, Marko
AU  - Todorović, Dejan
AU  - Liu, Hanquing
AU  - Verbiest, Gerard J.
AU  - van der Zant, Herre S. J.
AU  - Steeneken, Peter G.
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6801
AB  - Microphones exploit the motion of suspended membranes to detect sound waves. Since the microphone performance can be improved by reducing the thickness and mass of its sensing membrane, graphene-based microphones are expected to outperform state-of-the-art microelectromechanical (MEMS) microphones and allow further miniaturization of the device. Here, we present a laser vibrometry study of the acoustic response of suspended multilayer graphene membranes for microphone applications. We address performance parameters relevant for acoustic sensing, including mechanical sensitivity, limit of detection and nonlinear distortion, and discuss the trade-offs and limitations in the design of graphene microphones. We demonstrate superior mechanical sensitivities of the graphene membranes, reaching more than 2 orders of magnitude higher compliances than commercial MEMS devices, and report a limit of detection as low as 15 dBSPL, which is 10–15 dB lower than that featured by current MEMS microphones.
PB  - Royal Society of Chemistry
T2  - Nanoscale
T1  - Ultra-sensitive graphene membranes for microphone applications
VL  - 15
VL  - 6352
SP  - 6343
DO  - 10.1039/D2NR05147H
ER  - 

@article{
author = "Baglioni, Gabriele and Pezone, Roberto and Vollebregt, Sten and Cvetanović-Zobenica, Katarina and Spasenović, Marko and Todorović, Dejan and Liu, Hanquing and Verbiest, Gerard J. and van der Zant, Herre S. J. and Steeneken, Peter G.",
year = "2023",
abstract = "Microphones exploit the motion of suspended membranes to detect sound waves. Since the microphone performance can be improved by reducing the thickness and mass of its sensing membrane, graphene-based microphones are expected to outperform state-of-the-art microelectromechanical (MEMS) microphones and allow further miniaturization of the device. Here, we present a laser vibrometry study of the acoustic response of suspended multilayer graphene membranes for microphone applications. We address performance parameters relevant for acoustic sensing, including mechanical sensitivity, limit of detection and nonlinear distortion, and discuss the trade-offs and limitations in the design of graphene microphones. We demonstrate superior mechanical sensitivities of the graphene membranes, reaching more than 2 orders of magnitude higher compliances than commercial MEMS devices, and report a limit of detection as low as 15 dBSPL, which is 10–15 dB lower than that featured by current MEMS microphones.",
publisher = "Royal Society of Chemistry",
journal = "Nanoscale",
title = "Ultra-sensitive graphene membranes for microphone applications",
volume = "15, 6352",
pages = "6343",
doi = "10.1039/D2NR05147H"
}

Baglioni, G., Pezone, R., Vollebregt, S., Cvetanović-Zobenica, K., Spasenović, M., Todorović, D., Liu, H., Verbiest, G. J., van der Zant, H. S. J.,& Steeneken, P. G.. (2023). Ultra-sensitive graphene membranes for microphone applications. in Nanoscale
Royal Society of Chemistry., 15, 6343.
https://doi.org/10.1039/D2NR05147H

Baglioni G, Pezone R, Vollebregt S, Cvetanović-Zobenica K, Spasenović M, Todorović D, Liu H, Verbiest GJ, van der Zant HSJ, Steeneken PG. Ultra-sensitive graphene membranes for microphone applications. in Nanoscale. 2023;15:6343.
doi:10.1039/D2NR05147H .

Baglioni, Gabriele, Pezone, Roberto, Vollebregt, Sten, Cvetanović-Zobenica, Katarina, Spasenović, Marko, Todorović, Dejan, Liu, Hanquing, Verbiest, Gerard J., van der Zant, Herre S. J., Steeneken, Peter G., "Ultra-sensitive graphene membranes for microphone applications" in Nanoscale, 15 (2023):6343,
https://doi.org/10.1039/D2NR05147H . .

TY  - JOUR
AU  - Jovanović, Djordje
AU  - Petrović, Miloš
AU  - Tomašević-Ilić, Tijana
AU  - Matković, Aleksandar
AU  - Bokalič, Matevž
AU  - Spasenović, Marko
AU  - Rogdakis, Konstantinos
AU  - Kymakis, Emmannuel
AU  - Knežević, Dragan
AU  - Cina, Lucio
AU  - Gajić, Radoš
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6491
AB  - A long operational lifetime is required for the use of solar cells in real-life photovoltaic applications. The optimization of operational lifetimes is achieved through understanding the inherent degradation phenomena in solar cells. In this study, graphene/Si Schottky-junction solar cells were produced, utilizing liquid-phase-exfoliated graphene as an active surface. The operational and interface stability of these solar cells over a period of 5 years in ambient conditions (following ISOS-D protocols: dark storage/shelf life) was examined, and the origin of their degradation was reported. It was found that the dominant degradation mechanism could be attributed to the degradation of silver contacts. This was indicated by a decrease in shunt resistance, an increase in the ideality factor (due to a higher carrier recombination), and a constant defect density in graphene films for up to 4 years. Measurements across the solar cell's active area during the 5-year period revealed neither significant spatial inhomogeneity, nor shunt channel defects.
PB  - Elsevier
T2  - Solar Energy Materials and Solar Cells
T1  - Long-term stability of graphene/c-Si Schottky-junction solar cells
VL  - 258
SP  - 112414
DO  - 10.1016/j.solmat.2023.112414
ER  - 

@article{
author = "Jovanović, Djordje and Petrović, Miloš and Tomašević-Ilić, Tijana and Matković, Aleksandar and Bokalič, Matevž and Spasenović, Marko and Rogdakis, Konstantinos and Kymakis, Emmannuel and Knežević, Dragan and Cina, Lucio and Gajić, Radoš",
year = "2023",
abstract = "A long operational lifetime is required for the use of solar cells in real-life photovoltaic applications. The optimization of operational lifetimes is achieved through understanding the inherent degradation phenomena in solar cells. In this study, graphene/Si Schottky-junction solar cells were produced, utilizing liquid-phase-exfoliated graphene as an active surface. The operational and interface stability of these solar cells over a period of 5 years in ambient conditions (following ISOS-D protocols: dark storage/shelf life) was examined, and the origin of their degradation was reported. It was found that the dominant degradation mechanism could be attributed to the degradation of silver contacts. This was indicated by a decrease in shunt resistance, an increase in the ideality factor (due to a higher carrier recombination), and a constant defect density in graphene films for up to 4 years. Measurements across the solar cell's active area during the 5-year period revealed neither significant spatial inhomogeneity, nor shunt channel defects.",
publisher = "Elsevier",
journal = "Solar Energy Materials and Solar Cells",
title = "Long-term stability of graphene/c-Si Schottky-junction solar cells",
volume = "258",
pages = "112414",
doi = "10.1016/j.solmat.2023.112414"
}

Jovanović, D., Petrović, M., Tomašević-Ilić, T., Matković, A., Bokalič, M., Spasenović, M., Rogdakis, K., Kymakis, E., Knežević, D., Cina, L.,& Gajić, R.. (2023). Long-term stability of graphene/c-Si Schottky-junction solar cells. in Solar Energy Materials and Solar Cells
Elsevier., 258, 112414.
https://doi.org/10.1016/j.solmat.2023.112414

Jovanović D, Petrović M, Tomašević-Ilić T, Matković A, Bokalič M, Spasenović M, Rogdakis K, Kymakis E, Knežević D, Cina L, Gajić R. Long-term stability of graphene/c-Si Schottky-junction solar cells. in Solar Energy Materials and Solar Cells. 2023;258:112414.
doi:10.1016/j.solmat.2023.112414 .

Jovanović, Djordje, Petrović, Miloš, Tomašević-Ilić, Tijana, Matković, Aleksandar, Bokalič, Matevž, Spasenović, Marko, Rogdakis, Konstantinos, Kymakis, Emmannuel, Knežević, Dragan, Cina, Lucio, Gajić, Radoš, "Long-term stability of graphene/c-Si Schottky-junction solar cells" in Solar Energy Materials and Solar Cells, 258 (2023):112414,
https://doi.org/10.1016/j.solmat.2023.112414 . .

TY  - JOUR
AU  - Jovanović, Djordje
AU  - Petrović, Miloš
AU  - Tomašević-Ilić, Tijana
AU  - Matković, Aleksandar
AU  - Bokalič, Matevž
AU  - Spasenović, Marko
AU  - Rogdakis, Konstantinos
AU  - Kymakis, Emmannuel
AU  - Knežević, Dragan
AU  - Cina, Lucio
AU  - Gajić, Radoš
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6490
AB  - A long operational lifetime is required for the use of solar cells in real-life photovoltaic applications. The optimization of operational lifetimes is achieved through understanding the inherent degradation phenomena in solar cells. In this study, graphene/Si Schottky-junction solar cells were produced, utilizing liquid-phase-exfoliated graphene as an active surface. The operational and interface stability of these solar cells over a period of 5 years in ambient conditions (following ISOS-D protocols: dark storage/shelf life) was examined, and the origin of their degradation was reported. It was found that the dominant degradation mechanism could be attributed to the degradation of silver contacts. This was indicated by a decrease in shunt resistance, an increase in the ideality factor (due to a higher carrier recombination), and a constant defect density in graphene films for up to 4 years. Measurements across the solar cell's active area during the 5-year period revealed neither significant spatial inhomogeneity, nor shunt channel defects.
PB  - Elsevier
T2  - Solar Energy Materials and Solar Cells
T1  - Long-term stability of graphene/c-Si Schottky-junction solar cells
VL  - 258
SP  - 112414
DO  - 10.1016/j.solmat.2023.112414
ER  - 

@article{
author = "Jovanović, Djordje and Petrović, Miloš and Tomašević-Ilić, Tijana and Matković, Aleksandar and Bokalič, Matevž and Spasenović, Marko and Rogdakis, Konstantinos and Kymakis, Emmannuel and Knežević, Dragan and Cina, Lucio and Gajić, Radoš",
year = "2023",
abstract = "A long operational lifetime is required for the use of solar cells in real-life photovoltaic applications. The optimization of operational lifetimes is achieved through understanding the inherent degradation phenomena in solar cells. In this study, graphene/Si Schottky-junction solar cells were produced, utilizing liquid-phase-exfoliated graphene as an active surface. The operational and interface stability of these solar cells over a period of 5 years in ambient conditions (following ISOS-D protocols: dark storage/shelf life) was examined, and the origin of their degradation was reported. It was found that the dominant degradation mechanism could be attributed to the degradation of silver contacts. This was indicated by a decrease in shunt resistance, an increase in the ideality factor (due to a higher carrier recombination), and a constant defect density in graphene films for up to 4 years. Measurements across the solar cell's active area during the 5-year period revealed neither significant spatial inhomogeneity, nor shunt channel defects.",
publisher = "Elsevier",
journal = "Solar Energy Materials and Solar Cells",
title = "Long-term stability of graphene/c-Si Schottky-junction solar cells",
volume = "258",
pages = "112414",
doi = "10.1016/j.solmat.2023.112414"
}

Jovanović, D., Petrović, M., Tomašević-Ilić, T., Matković, A., Bokalič, M., Spasenović, M., Rogdakis, K., Kymakis, E., Knežević, D., Cina, L.,& Gajić, R.. (2023). Long-term stability of graphene/c-Si Schottky-junction solar cells. in Solar Energy Materials and Solar Cells
Elsevier., 258, 112414.
https://doi.org/10.1016/j.solmat.2023.112414

Jovanović D, Petrović M, Tomašević-Ilić T, Matković A, Bokalič M, Spasenović M, Rogdakis K, Kymakis E, Knežević D, Cina L, Gajić R. Long-term stability of graphene/c-Si Schottky-junction solar cells. in Solar Energy Materials and Solar Cells. 2023;258:112414.
doi:10.1016/j.solmat.2023.112414 .

Jovanović, Djordje, Petrović, Miloš, Tomašević-Ilić, Tijana, Matković, Aleksandar, Bokalič, Matevž, Spasenović, Marko, Rogdakis, Konstantinos, Kymakis, Emmannuel, Knežević, Dragan, Cina, Lucio, Gajić, Radoš, "Long-term stability of graphene/c-Si Schottky-junction solar cells" in Solar Energy Materials and Solar Cells, 258 (2023):112414,
https://doi.org/10.1016/j.solmat.2023.112414 . .

TY  - JOUR
AU  - Salom, Iva
AU  - Dimić, Goran
AU  - Čelebić, Vladimir
AU  - Spasenović, Marko
AU  - Raičković, Milica
AU  - Mihajlović, Mirjana
AU  - Todorović, Dejan
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5639
AB  - Airborne acoustic surveillance would enable and ease several applications, including
security surveillance, urban and industrial noise monitoring, rescue missions, and wildlife monitoring.
Airborne surveillance with an acoustic camera mounted on an airship would provide the deployment
flexibility and utility required by these applications. Nevertheless, and problematically for these
applications, there is not a single acoustic camera mounted on an airship yet. We make significant
advances towards solving this problem by designing and constructing an acoustic camera for direct
mounting on the hull of a UAV airship. The camera consists of 64 microphones, a central processing
unit, and software for data acquisition and processing dedicatedly developed for far-field low-level
acoustic signal detection. We demonstrate a large-aperture mock-up camera operation on the ground,
although all preparations have been made to integrate the camera onto an airship. The camera has
an aperture of 2 m and has been designed for surveillance from a height up to 300 m, with a spatial
resolution of 12 m.
PB  - Switzerland : Multidisciplinary Digital Publishing Institute (MDPI)
T2  - Sensors
T1  - An Acoustic Camera for Use on UAVs
VL  - 23
IS  - 2
SP  - 880
DO  - 10.3390/s23020880
ER  - 

@article{
author = "Salom, Iva and Dimić, Goran and Čelebić, Vladimir and Spasenović, Marko and Raičković, Milica and Mihajlović, Mirjana and Todorović, Dejan",
year = "2023",
abstract = "Airborne acoustic surveillance would enable and ease several applications, including
security surveillance, urban and industrial noise monitoring, rescue missions, and wildlife monitoring.
Airborne surveillance with an acoustic camera mounted on an airship would provide the deployment
flexibility and utility required by these applications. Nevertheless, and problematically for these
applications, there is not a single acoustic camera mounted on an airship yet. We make significant
advances towards solving this problem by designing and constructing an acoustic camera for direct
mounting on the hull of a UAV airship. The camera consists of 64 microphones, a central processing
unit, and software for data acquisition and processing dedicatedly developed for far-field low-level
acoustic signal detection. We demonstrate a large-aperture mock-up camera operation on the ground,
although all preparations have been made to integrate the camera onto an airship. The camera has
an aperture of 2 m and has been designed for surveillance from a height up to 300 m, with a spatial
resolution of 12 m.",
publisher = "Switzerland : Multidisciplinary Digital Publishing Institute (MDPI)",
journal = "Sensors",
title = "An Acoustic Camera for Use on UAVs",
volume = "23",
number = "2",
pages = "880",
doi = "10.3390/s23020880"
}

Salom, I., Dimić, G., Čelebić, V., Spasenović, M., Raičković, M., Mihajlović, M.,& Todorović, D.. (2023). An Acoustic Camera for Use on UAVs. in Sensors
Switzerland : Multidisciplinary Digital Publishing Institute (MDPI)., 23(2), 880.
https://doi.org/10.3390/s23020880

Salom I, Dimić G, Čelebić V, Spasenović M, Raičković M, Mihajlović M, Todorović D. An Acoustic Camera for Use on UAVs. in Sensors. 2023;23(2):880.
doi:10.3390/s23020880 .

Salom, Iva, Dimić, Goran, Čelebić, Vladimir, Spasenović, Marko, Raičković, Milica, Mihajlović, Mirjana, Todorović, Dejan, "An Acoustic Camera for Use on UAVs" in Sensors, 23, no. 2 (2023):880,
https://doi.org/10.3390/s23020880 . .

TY  - CONF
AU  - Rašljić Rafajilović, Milena
AU  - Pergal, Marija
AU  - Spasenović, Marko
AU  - Vićentić, Teodora
AU  - Bajuk-Bogdanović, Danica
AU  - Vasiljević-Radović, Dana
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5750
AB  - Laser induced graphenization (LIG) of polymer materials has recognized as the most promising method for fabrication of flexible electronic devices. Poly(dimethylsiloxane) (PDMS) is suitable elastomeric materials for flexible electronics devices fabrication due to outstanding mechanical and optical properties. Namely, the low carbon content and the lacking aromatic structures in PDMS material limit the graphenization process resulting in limited conduction properties. The aim of this study was the graphenization of PDMS and PDMS-based materials by CO2 laser radiation. We prepared pure PDMS elastomer, PDMS/ethylene glycol and PDMS/Triton composite materials by using 20 wt. % of ethylene glycol or Triton in PDMS matrix. Indeed, up to now the evidence of graphenization of these PDMS-based materials has never been observed. PDMS elastomer was prepared by hydrosilylation reaction, while composite materials by blending method. The prepared PDMS-based materials were characterized by Fourier-transform infrared spectroscopy (FTIR), atomic force microscopy (AFM) and Raman spectroscopy. The obtained results showed that surfaces of pure PDMS elastomer and PDMS/ethylene glycol composite cannot be graphenized by direct laser writing. However, by adding Triton as aromatic and carbon sources into the PDMS matrix it is possible to improve the graphenization of PDMS based materials and this material is good candidate for fabrication of flexible electrodes.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the book of abstracts - Serbian Ceramic Society Conference - Advanced Ceramics and Application X - New Frontiers in Multifunctional Material Science and Processing, 26-27. September 2022, Belgrade, Serbia
T1  - Preparation of poly(dimethylsiloxane)-based materials for laser-induced graphenization
SP  - 87
EP  - 87
UR  - https://hdl.handle.net/21.15107/rcub_cer_5750
ER  - 

@conference{
author = "Rašljić Rafajilović, Milena and Pergal, Marija and Spasenović, Marko and Vićentić, Teodora and Bajuk-Bogdanović, Danica and Vasiljević-Radović, Dana",
year = "2022",
abstract = "Laser induced graphenization (LIG) of polymer materials has recognized as the most promising method for fabrication of flexible electronic devices. Poly(dimethylsiloxane) (PDMS) is suitable elastomeric materials for flexible electronics devices fabrication due to outstanding mechanical and optical properties. Namely, the low carbon content and the lacking aromatic structures in PDMS material limit the graphenization process resulting in limited conduction properties. The aim of this study was the graphenization of PDMS and PDMS-based materials by CO2 laser radiation. We prepared pure PDMS elastomer, PDMS/ethylene glycol and PDMS/Triton composite materials by using 20 wt. % of ethylene glycol or Triton in PDMS matrix. Indeed, up to now the evidence of graphenization of these PDMS-based materials has never been observed. PDMS elastomer was prepared by hydrosilylation reaction, while composite materials by blending method. The prepared PDMS-based materials were characterized by Fourier-transform infrared spectroscopy (FTIR), atomic force microscopy (AFM) and Raman spectroscopy. The obtained results showed that surfaces of pure PDMS elastomer and PDMS/ethylene glycol composite cannot be graphenized by direct laser writing. However, by adding Triton as aromatic and carbon sources into the PDMS matrix it is possible to improve the graphenization of PDMS based materials and this material is good candidate for fabrication of flexible electrodes.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the book of abstracts - Serbian Ceramic Society Conference - Advanced Ceramics and Application X - New Frontiers in Multifunctional Material Science and Processing, 26-27. September 2022, Belgrade, Serbia",
title = "Preparation of poly(dimethylsiloxane)-based materials for laser-induced graphenization",
pages = "87-87",
url = "https://hdl.handle.net/21.15107/rcub_cer_5750"
}

Rašljić Rafajilović, M., Pergal, M., Spasenović, M., Vićentić, T., Bajuk-Bogdanović, D.,& Vasiljević-Radović, D.. (2022). Preparation of poly(dimethylsiloxane)-based materials for laser-induced graphenization. in Program and the book of abstracts - Serbian Ceramic Society Conference - Advanced Ceramics and Application X - New Frontiers in Multifunctional Material Science and Processing, 26-27. September 2022, Belgrade, Serbia
Belgrade : Serbian Ceramic Society., 87-87.
https://hdl.handle.net/21.15107/rcub_cer_5750

Rašljić Rafajilović M, Pergal M, Spasenović M, Vićentić T, Bajuk-Bogdanović D, Vasiljević-Radović D. Preparation of poly(dimethylsiloxane)-based materials for laser-induced graphenization. in Program and the book of abstracts - Serbian Ceramic Society Conference - Advanced Ceramics and Application X - New Frontiers in Multifunctional Material Science and Processing, 26-27. September 2022, Belgrade, Serbia. 2022;:87-87.
https://hdl.handle.net/21.15107/rcub_cer_5750 .

Rašljić Rafajilović, Milena, Pergal, Marija, Spasenović, Marko, Vićentić, Teodora, Bajuk-Bogdanović, Danica, Vasiljević-Radović, Dana, "Preparation of poly(dimethylsiloxane)-based materials for laser-induced graphenization" in Program and the book of abstracts - Serbian Ceramic Society Conference - Advanced Ceramics and Application X - New Frontiers in Multifunctional Material Science and Processing, 26-27. September 2022, Belgrade, Serbia (2022):87-87,
https://hdl.handle.net/21.15107/rcub_cer_5750 .

TY  - CONF
AU  - Rašljić Rafajilović, Milena
AU  - Vasiljević-Radović, Dana
AU  - Vićentić, Teodora
AU  - Spasenović, Marko
AU  - Bošković, Marko
AU  - Pašti, Igor
AU  - Pergal, Marija
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5723
AB  - Laser-induced graphene (LIG) is one of the most promising graphene-based materials for the
fabrication of flexible electronic devices. However, despite huge efforts to develop LIG on new
substrates there is a lack of stretchable polymers convenient for laser graphenization.
Poly(dimethylsiloxane) is elastomer suitable for flexible electronic fabrication due to excellent
flexibility, optical transparency, hydrophobicity, UV-resistance and good thermal and oxidative
stability. Unfortunately, PDMS cannot be easily graphenized by direct laser writing because of the
low amount of carbon linked to the siloxane chains, mainly consisting of methyl groups. In this
study, a series of PDMS/Triton materials with different concentrations of Triton (1-30 wt.%) was
prepared by casted-based approach starting from divinyl-terminated-PDMS and poly(methylhydrogensiloxane).
Furthermore, direct laser graphenization of PDMS/Triton materials is proposed
for the first time. Different laser parameters and multiple writing steps have been examined in order
to induce a graphene-like structure on PDMS/Triton and to increase as much as possible its
conductivity. The prepared PDMS/Triton/graphene composites were characterized by Raman
spectroscopy, scanning electron microscopy (SEM) and sheet resistance measurements. The results
revealed that by adding Triton it is possible to enhance the graphenization degree. The obtained
PDMS/Triton/graphene composites are suitable candidates for flexible microsupercapacitor
fabrication.
PB  - Banja Luka : University in Banjaluka, Faculty of  Technology
C3  - Book of Abstracts - XIV Conference of  Chemists, Technologists and Environmentalists of Republic of Srpska, October 21-22, 2022, Banja Luka
T1  - Characterization of poly(dimethylsiloxane)/laser-induced graphene composites
SP  - 196
UR  - https://hdl.handle.net/21.15107/rcub_cer_5723
ER  - 

@conference{
author = "Rašljić Rafajilović, Milena and Vasiljević-Radović, Dana and Vićentić, Teodora and Spasenović, Marko and Bošković, Marko and Pašti, Igor and Pergal, Marija",
year = "2022",
abstract = "Laser-induced graphene (LIG) is one of the most promising graphene-based materials for the
fabrication of flexible electronic devices. However, despite huge efforts to develop LIG on new
substrates there is a lack of stretchable polymers convenient for laser graphenization.
Poly(dimethylsiloxane) is elastomer suitable for flexible electronic fabrication due to excellent
flexibility, optical transparency, hydrophobicity, UV-resistance and good thermal and oxidative
stability. Unfortunately, PDMS cannot be easily graphenized by direct laser writing because of the
low amount of carbon linked to the siloxane chains, mainly consisting of methyl groups. In this
study, a series of PDMS/Triton materials with different concentrations of Triton (1-30 wt.%) was
prepared by casted-based approach starting from divinyl-terminated-PDMS and poly(methylhydrogensiloxane).
Furthermore, direct laser graphenization of PDMS/Triton materials is proposed
for the first time. Different laser parameters and multiple writing steps have been examined in order
to induce a graphene-like structure on PDMS/Triton and to increase as much as possible its
conductivity. The prepared PDMS/Triton/graphene composites were characterized by Raman
spectroscopy, scanning electron microscopy (SEM) and sheet resistance measurements. The results
revealed that by adding Triton it is possible to enhance the graphenization degree. The obtained
PDMS/Triton/graphene composites are suitable candidates for flexible microsupercapacitor
fabrication.",
publisher = "Banja Luka : University in Banjaluka, Faculty of  Technology",
journal = "Book of Abstracts - XIV Conference of  Chemists, Technologists and Environmentalists of Republic of Srpska, October 21-22, 2022, Banja Luka",
title = "Characterization of poly(dimethylsiloxane)/laser-induced graphene composites",
pages = "196",
url = "https://hdl.handle.net/21.15107/rcub_cer_5723"
}

Rašljić Rafajilović, M., Vasiljević-Radović, D., Vićentić, T., Spasenović, M., Bošković, M., Pašti, I.,& Pergal, M.. (2022). Characterization of poly(dimethylsiloxane)/laser-induced graphene composites. in Book of Abstracts - XIV Conference of  Chemists, Technologists and Environmentalists of Republic of Srpska, October 21-22, 2022, Banja Luka
Banja Luka : University in Banjaluka, Faculty of  Technology., 196.
https://hdl.handle.net/21.15107/rcub_cer_5723

Rašljić Rafajilović M, Vasiljević-Radović D, Vićentić T, Spasenović M, Bošković M, Pašti I, Pergal M. Characterization of poly(dimethylsiloxane)/laser-induced graphene composites. in Book of Abstracts - XIV Conference of  Chemists, Technologists and Environmentalists of Republic of Srpska, October 21-22, 2022, Banja Luka. 2022;:196.
https://hdl.handle.net/21.15107/rcub_cer_5723 .

Rašljić Rafajilović, Milena, Vasiljević-Radović, Dana, Vićentić, Teodora, Spasenović, Marko, Bošković, Marko, Pašti, Igor, Pergal, Marija, "Characterization of poly(dimethylsiloxane)/laser-induced graphene composites" in Book of Abstracts - XIV Conference of  Chemists, Technologists and Environmentalists of Republic of Srpska, October 21-22, 2022, Banja Luka (2022):196,
https://hdl.handle.net/21.15107/rcub_cer_5723 .

TY  - JOUR
AU  - Vićentić, Teodora
AU  - Rašljić Rafajilović, Milena
AU  - Ilić, Stefan
AU  - Koteska, Bojana
AU  - Madevska Bogdanova, Ana
AU  - Pašti, Igor
AU  - Lehocki, Fedor
AU  - Spasenović, Marko
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5559
AB  - The HeartPy Python toolkit for analysis of noisy signals from heart rate measurements is an excellent tool to use in conjunction with novel wearable sensors. Nevertheless, most of the work to date has focused on applying the toolkit to data measured with commercially available sensors. We demonstrate the application of the HeartPy functions to data obtained with a novel graphene-based heartbeat sensor. We produce the sensor by laser-inducing graphene on a flexible polyimide substrate. Both graphene on the polyimide substrate and graphene transferred onto a PDMS substrate show piezoresistive behavior that can be utilized to measure human heartbeat by registering median cubital vein motion during blood pumping. We process electrical resistance data from the graphene sensor using HeartPy and demonstrate extraction of several heartbeat parameters, in agreement with measurements taken with independent reference sensors. We compare the quality of the heartbeat signal from graphene on different substrates, demonstrating that in all cases the device yields results consistent with reference sensors. Our work is a first demonstration of successful application of HeartPy to analysis of data from a sensor in development.
PB  - MDPI AG
T2  - Sensors
T1  - Laser-Induced Graphene for Heartbeat Monitoring with HeartPy Analysis
VL  - 22
IS  - 17
SP  - 6326
DO  - 10.3390/s22176326
ER  - 

@article{
author = "Vićentić, Teodora and Rašljić Rafajilović, Milena and Ilić, Stefan and Koteska, Bojana and Madevska Bogdanova, Ana and Pašti, Igor and Lehocki, Fedor and Spasenović, Marko",
year = "2022",
abstract = "The HeartPy Python toolkit for analysis of noisy signals from heart rate measurements is an excellent tool to use in conjunction with novel wearable sensors. Nevertheless, most of the work to date has focused on applying the toolkit to data measured with commercially available sensors. We demonstrate the application of the HeartPy functions to data obtained with a novel graphene-based heartbeat sensor. We produce the sensor by laser-inducing graphene on a flexible polyimide substrate. Both graphene on the polyimide substrate and graphene transferred onto a PDMS substrate show piezoresistive behavior that can be utilized to measure human heartbeat by registering median cubital vein motion during blood pumping. We process electrical resistance data from the graphene sensor using HeartPy and demonstrate extraction of several heartbeat parameters, in agreement with measurements taken with independent reference sensors. We compare the quality of the heartbeat signal from graphene on different substrates, demonstrating that in all cases the device yields results consistent with reference sensors. Our work is a first demonstration of successful application of HeartPy to analysis of data from a sensor in development.",
publisher = "MDPI AG",
journal = "Sensors",
title = "Laser-Induced Graphene for Heartbeat Monitoring with HeartPy Analysis",
volume = "22",
number = "17",
pages = "6326",
doi = "10.3390/s22176326"
}

Vićentić, T., Rašljić Rafajilović, M., Ilić, S., Koteska, B., Madevska Bogdanova, A., Pašti, I., Lehocki, F.,& Spasenović, M.. (2022). Laser-Induced Graphene for Heartbeat Monitoring with HeartPy Analysis. in Sensors
MDPI AG., 22(17), 6326.
https://doi.org/10.3390/s22176326

Vićentić T, Rašljić Rafajilović M, Ilić S, Koteska B, Madevska Bogdanova A, Pašti I, Lehocki F, Spasenović M. Laser-Induced Graphene for Heartbeat Monitoring with HeartPy Analysis. in Sensors. 2022;22(17):6326.
doi:10.3390/s22176326 .

Vićentić, Teodora, Rašljić Rafajilović, Milena, Ilić, Stefan, Koteska, Bojana, Madevska Bogdanova, Ana, Pašti, Igor, Lehocki, Fedor, Spasenović, Marko, "Laser-Induced Graphene for Heartbeat Monitoring with HeartPy Analysis" in Sensors, 22, no. 17 (2022):6326,
https://doi.org/10.3390/s22176326 . .

TY  - CONF
AU  - Vićentić, Teodora
AU  - Rašljić Rafajilović, Milena
AU  - Ilić, Stefan
AU  - Koteska, Bojana
AU  - Madevska Bogdanova, Ana
AU  - Pašti, Igor
AU  - Lehocki, Fedor
AU  - Spasenović, Marko
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5722
AB  - Wearable sensors are reaching maturity, at the
same time as technologies for communicating physiological data
and those for analyzing massive amounts of data. The
combination of the three technologies invites for applications in
mass screening of personal health through smart algorithm
deployment on data from wearable patches. We propose and
present an architecture for a wearable patch to be used in mass
casualty emergency situations, or for hospital bedside
monitoring. The proposed patch will contain multiple sensors of
physiological parameters. We propose to create respiration and
heartbeat sensors made of laser induced graphene. We show
that graphene on flexible substrates can be utilized in
conjunction with the Python heart rate analysis toolkit -
HeartPy to reliably acquire physiological data from human
subjects
PB  - The Institute of Doctors Engineers and Scientists (IDES)
PB  - The Association of Computer Electrical Electronics and Communication (ACEECom)
C3  - 19th International Conference on Informatics and Information Technologies, CIIT 2022
T1  - Wearable Patch for Mass Casualty Screening with Graphene Sensors
SP  - 99
EP  - 102
UR  - https://hdl.handle.net/21.15107/rcub_cer_5722
ER  - 

@conference{
author = "Vićentić, Teodora and Rašljić Rafajilović, Milena and Ilić, Stefan and Koteska, Bojana and Madevska Bogdanova, Ana and Pašti, Igor and Lehocki, Fedor and Spasenović, Marko",
year = "2022",
abstract = "Wearable sensors are reaching maturity, at the
same time as technologies for communicating physiological data
and those for analyzing massive amounts of data. The
combination of the three technologies invites for applications in
mass screening of personal health through smart algorithm
deployment on data from wearable patches. We propose and
present an architecture for a wearable patch to be used in mass
casualty emergency situations, or for hospital bedside
monitoring. The proposed patch will contain multiple sensors of
physiological parameters. We propose to create respiration and
heartbeat sensors made of laser induced graphene. We show
that graphene on flexible substrates can be utilized in
conjunction with the Python heart rate analysis toolkit -
HeartPy to reliably acquire physiological data from human
subjects",
publisher = "The Institute of Doctors Engineers and Scientists (IDES), The Association of Computer Electrical Electronics and Communication (ACEECom)",
journal = "19th International Conference on Informatics and Information Technologies, CIIT 2022",
title = "Wearable Patch for Mass Casualty Screening with Graphene Sensors",
pages = "99-102",
url = "https://hdl.handle.net/21.15107/rcub_cer_5722"
}

Vićentić, T., Rašljić Rafajilović, M., Ilić, S., Koteska, B., Madevska Bogdanova, A., Pašti, I., Lehocki, F.,& Spasenović, M.. (2022). Wearable Patch for Mass Casualty Screening with Graphene Sensors. in 19th International Conference on Informatics and Information Technologies, CIIT 2022
The Institute of Doctors Engineers and Scientists (IDES)., 99-102.
https://hdl.handle.net/21.15107/rcub_cer_5722

Vićentić T, Rašljić Rafajilović M, Ilić S, Koteska B, Madevska Bogdanova A, Pašti I, Lehocki F, Spasenović M. Wearable Patch for Mass Casualty Screening with Graphene Sensors. in 19th International Conference on Informatics and Information Technologies, CIIT 2022. 2022;:99-102.
https://hdl.handle.net/21.15107/rcub_cer_5722 .

Vićentić, Teodora, Rašljić Rafajilović, Milena, Ilić, Stefan, Koteska, Bojana, Madevska Bogdanova, Ana, Pašti, Igor, Lehocki, Fedor, Spasenović, Marko, "Wearable Patch for Mass Casualty Screening with Graphene Sensors" in 19th International Conference on Informatics and Information Technologies, CIIT 2022 (2022):99-102,
https://hdl.handle.net/21.15107/rcub_cer_5722 .

TY  - JOUR
AU  - Andrić, Stevan
AU  - Tomašević-Ilić, Tijana
AU  - Rakočević, Lazar
AU  - Vasiljević-Radović, Dana
AU  - Spasenović, Marko
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5611
AB  - Measuring relative humidity is important for a myriad of industries, including production, agriculture, environmental monitoring, and medicine. Thin-film, fast-response sensors are particularly interesting for wearable applications, such as monitoring breathing. We report on humidity sensors made from graphene deposited as a thin film by the Langmuir–Blodgett (LB) method from three types of graphene in solution. We demonstrate humidity sensing and respiration monitoring from graphene made by bath sonication, probe sonication, and electrochemical exfoliation. We characterize the morphology and chemical composition of the three film types and compare their performance as sensors. We conclude that although all three types can be used for sensing, they each have their particular advantages and drawbacks.
PB  - MYU K.K.
T2  - Sensors and Materials
T1  - Three Types of Films from Liquid-phase-exfoliated Graphene for Use as Humidity Sensors and Respiration Monitors
VL  - 34
IS  - 11
SP  - 3933
DO  - 10.18494/SAM4092
ER  - 

@article{
author = "Andrić, Stevan and Tomašević-Ilić, Tijana and Rakočević, Lazar and Vasiljević-Radović, Dana and Spasenović, Marko",
year = "2022",
abstract = "Measuring relative humidity is important for a myriad of industries, including production, agriculture, environmental monitoring, and medicine. Thin-film, fast-response sensors are particularly interesting for wearable applications, such as monitoring breathing. We report on humidity sensors made from graphene deposited as a thin film by the Langmuir–Blodgett (LB) method from three types of graphene in solution. We demonstrate humidity sensing and respiration monitoring from graphene made by bath sonication, probe sonication, and electrochemical exfoliation. We characterize the morphology and chemical composition of the three film types and compare their performance as sensors. We conclude that although all three types can be used for sensing, they each have their particular advantages and drawbacks.",
publisher = "MYU K.K.",
journal = "Sensors and Materials",
title = "Three Types of Films from Liquid-phase-exfoliated Graphene for Use as Humidity Sensors and Respiration Monitors",
volume = "34",
number = "11",
pages = "3933",
doi = "10.18494/SAM4092"
}

Andrić, S., Tomašević-Ilić, T., Rakočević, L., Vasiljević-Radović, D.,& Spasenović, M.. (2022). Three Types of Films from Liquid-phase-exfoliated Graphene for Use as Humidity Sensors and Respiration Monitors. in Sensors and Materials
MYU K.K.., 34(11), 3933.
https://doi.org/10.18494/SAM4092

Andrić S, Tomašević-Ilić T, Rakočević L, Vasiljević-Radović D, Spasenović M. Three Types of Films from Liquid-phase-exfoliated Graphene for Use as Humidity Sensors and Respiration Monitors. in Sensors and Materials. 2022;34(11):3933.
doi:10.18494/SAM4092 .

Andrić, Stevan, Tomašević-Ilić, Tijana, Rakočević, Lazar, Vasiljević-Radović, Dana, Spasenović, Marko, "Three Types of Films from Liquid-phase-exfoliated Graphene for Use as Humidity Sensors and Respiration Monitors" in Sensors and Materials, 34, no. 11 (2022):3933,
https://doi.org/10.18494/SAM4092 . .

TY  - JOUR
AU  - Lee, Kangho
AU  - Szydłowska, Beata M.
AU  - Hartwig, Oliver
AU  - Synnatschke, Kevin
AU  - Tywoniuk, Bartlomiej
AU  - Hartman, Tomáš
AU  - Tomašević-Ilić, Tijana
AU  - Gabbett, Cian P.
AU  - Coleman, Jonathan N.
AU  - Sofer, Zdeněk
AU  - Spasenović, Marko
AU  - Backes, Claudia
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5635
AB  - Liquid-phase exfoliation (LPE) has been introduced as a versatile and scalable production method for two-dimensional (2D) materials. This method yields dispersions that allow for the fabrication of printable and flexible electronic devices. However, the fabrication of uniform and homogeneous films from LPE dispersions with a performance similar to that of bottom-up grown materials remains a challenge, as the film quality strongly influences the optical and electrical performance of devices. Furthermore, long-term stability remains a major challenge for all 2D material based applications. In this study, we report on highly conductive tiled network films made of platinum diselenide (PtSe2) flakes derived using a scalable LPE method. We characterized the homogeneous films in terms of morphology and electrical behavior. As an example of applicability, we produce a chemiresistive sensor structure with the PtSe2 films and show significant resistance changes upon periodic ammonia gas exposures, revealing a sub-0.1 part per million (ppm) detection limit (DL). More remarkably the devices are fully functional after 15 months, underlining the high stability of PtSe2 based devices.
PB  - Great Britain : Royal Society of Chemistry
T2  - Journal of Materials Chemistry C
T1  - Highly conductive and long-term stable films from liquid-phase exfoliated platinum diselenide
VL  - 11
IS  - 2
SP  - 593
EP  - 599
DO  - 10.1039/d2tc03889g
ER  - 

@article{
author = "Lee, Kangho and Szydłowska, Beata M. and Hartwig, Oliver and Synnatschke, Kevin and Tywoniuk, Bartlomiej and Hartman, Tomáš and Tomašević-Ilić, Tijana and Gabbett, Cian P. and Coleman, Jonathan N. and Sofer, Zdeněk and Spasenović, Marko and Backes, Claudia",
year = "2022",
abstract = "Liquid-phase exfoliation (LPE) has been introduced as a versatile and scalable production method for two-dimensional (2D) materials. This method yields dispersions that allow for the fabrication of printable and flexible electronic devices. However, the fabrication of uniform and homogeneous films from LPE dispersions with a performance similar to that of bottom-up grown materials remains a challenge, as the film quality strongly influences the optical and electrical performance of devices. Furthermore, long-term stability remains a major challenge for all 2D material based applications. In this study, we report on highly conductive tiled network films made of platinum diselenide (PtSe2) flakes derived using a scalable LPE method. We characterized the homogeneous films in terms of morphology and electrical behavior. As an example of applicability, we produce a chemiresistive sensor structure with the PtSe2 films and show significant resistance changes upon periodic ammonia gas exposures, revealing a sub-0.1 part per million (ppm) detection limit (DL). More remarkably the devices are fully functional after 15 months, underlining the high stability of PtSe2 based devices.",
publisher = "Great Britain : Royal Society of Chemistry",
journal = "Journal of Materials Chemistry C",
title = "Highly conductive and long-term stable films from liquid-phase exfoliated platinum diselenide",
volume = "11",
number = "2",
pages = "593-599",
doi = "10.1039/d2tc03889g"
}

Lee, K., Szydłowska, B. M., Hartwig, O., Synnatschke, K., Tywoniuk, B., Hartman, T., Tomašević-Ilić, T., Gabbett, C. P., Coleman, J. N., Sofer, Z., Spasenović, M.,& Backes, C.. (2022). Highly conductive and long-term stable films from liquid-phase exfoliated platinum diselenide. in Journal of Materials Chemistry C
Great Britain : Royal Society of Chemistry., 11(2), 593-599.
https://doi.org/10.1039/d2tc03889g

Lee K, Szydłowska BM, Hartwig O, Synnatschke K, Tywoniuk B, Hartman T, Tomašević-Ilić T, Gabbett CP, Coleman JN, Sofer Z, Spasenović M, Backes C. Highly conductive and long-term stable films from liquid-phase exfoliated platinum diselenide. in Journal of Materials Chemistry C. 2022;11(2):593-599.
doi:10.1039/d2tc03889g .

Lee, Kangho, Szydłowska, Beata M., Hartwig, Oliver, Synnatschke, Kevin, Tywoniuk, Bartlomiej, Hartman, Tomáš, Tomašević-Ilić, Tijana, Gabbett, Cian P., Coleman, Jonathan N., Sofer, Zdeněk, Spasenović, Marko, Backes, Claudia, "Highly conductive and long-term stable films from liquid-phase exfoliated platinum diselenide" in Journal of Materials Chemistry C, 11, no. 2 (2022):593-599,
https://doi.org/10.1039/d2tc03889g . .

TY  - CONF
AU  - Andrić, Stevan
AU  - Jokić, Ivana
AU  - Frantlović, Miloš
AU  - Radulović, Katarina
AU  - Spasenović, Marko
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5825
AB  - Graphene-based sensors have a great potential for applications in public and personal health protection, including defense and security fields. However, sensitivity and selectivity of such sensors are inherently dependent on adsorption properties of the graphene sensing layer, which is typically of heterogeneous morphology and/or of heterogeneous chemical composition due to intentionally introduced functionalizing elements or spontaneously adsorbed molecules during sensor fabrication or operation. Therefore, characterization and optimization of sensing layers is extremely important for achieving high sensing performance. In this work, we present a method for characterization of the heterogeneous sensing layer by using the frequency domain analysis of the sensor output signal. The method is based on the mathematical model we devised. Here, the model is presented in detail for the case of a surface with three types of adsorption sites, and then the method is applied for extraction of parameters that characterize adsorption properties of a graphene sensing layer.
PB  - Belgrade : The Military Technical Institute
C3  - Proceedings - 10th International Scientific Conference on Defensive Technologies, OTEH 2022, 13-14 October 2022, Belgrade, Serbia
T1  - Characterization of heterogeneous sensing layers in graphene-based gas sensors
UR  - https://hdl.handle.net/21.15107/rcub_cer_5825
ER  - 

@conference{
author = "Andrić, Stevan and Jokić, Ivana and Frantlović, Miloš and Radulović, Katarina and Spasenović, Marko",
year = "2022",
abstract = "Graphene-based sensors have a great potential for applications in public and personal health protection, including defense and security fields. However, sensitivity and selectivity of such sensors are inherently dependent on adsorption properties of the graphene sensing layer, which is typically of heterogeneous morphology and/or of heterogeneous chemical composition due to intentionally introduced functionalizing elements or spontaneously adsorbed molecules during sensor fabrication or operation. Therefore, characterization and optimization of sensing layers is extremely important for achieving high sensing performance. In this work, we present a method for characterization of the heterogeneous sensing layer by using the frequency domain analysis of the sensor output signal. The method is based on the mathematical model we devised. Here, the model is presented in detail for the case of a surface with three types of adsorption sites, and then the method is applied for extraction of parameters that characterize adsorption properties of a graphene sensing layer.",
publisher = "Belgrade : The Military Technical Institute",
journal = "Proceedings - 10th International Scientific Conference on Defensive Technologies, OTEH 2022, 13-14 October 2022, Belgrade, Serbia",
title = "Characterization of heterogeneous sensing layers in graphene-based gas sensors",
url = "https://hdl.handle.net/21.15107/rcub_cer_5825"
}

Andrić, S., Jokić, I., Frantlović, M., Radulović, K.,& Spasenović, M.. (2022). Characterization of heterogeneous sensing layers in graphene-based gas sensors. in Proceedings - 10th International Scientific Conference on Defensive Technologies, OTEH 2022, 13-14 October 2022, Belgrade, Serbia
Belgrade : The Military Technical Institute..
https://hdl.handle.net/21.15107/rcub_cer_5825

Andrić S, Jokić I, Frantlović M, Radulović K, Spasenović M. Characterization of heterogeneous sensing layers in graphene-based gas sensors. in Proceedings - 10th International Scientific Conference on Defensive Technologies, OTEH 2022, 13-14 October 2022, Belgrade, Serbia. 2022;.
https://hdl.handle.net/21.15107/rcub_cer_5825 .

Andrić, Stevan, Jokić, Ivana, Frantlović, Miloš, Radulović, Katarina, Spasenović, Marko, "Characterization of heterogeneous sensing layers in graphene-based gas sensors" in Proceedings - 10th International Scientific Conference on Defensive Technologies, OTEH 2022, 13-14 October 2022, Belgrade, Serbia (2022),
https://hdl.handle.net/21.15107/rcub_cer_5825 .

TY  - JOUR
AU  - Andrić, Stevan
AU  - Jokić, Ivana
AU  - Stevanović, Jelena
AU  - Spasenović, Marko
AU  - Frantlović, Miloš
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5583
AB  - Surfaces of adsorption-based gas sensors are often heterogeneous, with adsorption sites that differ in their affinities for gas particle binding. Knowing adsorption/desorption energies, surface densities and the relative abundance of sites of different types is important, because these parameters impact sensor sensitivity and selectivity, and are relevant for revealing the response-generating mechanisms. We show that the analysis of the noise of adsorption-based sensors can be used to study gas adsorption on heterogeneous sensing surfaces, which is applicable to industrially important liquid-phase exfoliated (LPE) graphene. Our results for CO2 adsorption on an LPE graphene surface, with different types of adsorption sites on graphene flake edges and basal planes, show that the noise spectrum data can be used to characterize such surfaces in terms of parameters that determine the sensing properties of the adsorbing material. Notably, the spectrum characteristic frequencies are an unambiguous indicator of the relative abundance of different types of adsorption sites on the sensing surface and their surface densities. We also demonstrate that spectrum features indicate the fraction of the binding sites that are already occupied by another gas species. The presented study can be applied to the design and production of graphene and other sensing surfaces with an optimal sensing performance.
PB  - MDPI AG
T2  - Chemosensors
T1  - Noise Spectrum as a Source of Information in Gas Sensors Based on Liquid-Phase Exfoliated Graphene
VL  - 10
IS  - 6
SP  - 224
DO  - 10.3390/chemosensors10060224
ER  - 

@article{
author = "Andrić, Stevan and Jokić, Ivana and Stevanović, Jelena and Spasenović, Marko and Frantlović, Miloš",
year = "2022",
abstract = "Surfaces of adsorption-based gas sensors are often heterogeneous, with adsorption sites that differ in their affinities for gas particle binding. Knowing adsorption/desorption energies, surface densities and the relative abundance of sites of different types is important, because these parameters impact sensor sensitivity and selectivity, and are relevant for revealing the response-generating mechanisms. We show that the analysis of the noise of adsorption-based sensors can be used to study gas adsorption on heterogeneous sensing surfaces, which is applicable to industrially important liquid-phase exfoliated (LPE) graphene. Our results for CO2 adsorption on an LPE graphene surface, with different types of adsorption sites on graphene flake edges and basal planes, show that the noise spectrum data can be used to characterize such surfaces in terms of parameters that determine the sensing properties of the adsorbing material. Notably, the spectrum characteristic frequencies are an unambiguous indicator of the relative abundance of different types of adsorption sites on the sensing surface and their surface densities. We also demonstrate that spectrum features indicate the fraction of the binding sites that are already occupied by another gas species. The presented study can be applied to the design and production of graphene and other sensing surfaces with an optimal sensing performance.",
publisher = "MDPI AG",
journal = "Chemosensors",
title = "Noise Spectrum as a Source of Information in Gas Sensors Based on Liquid-Phase Exfoliated Graphene",
volume = "10",
number = "6",
pages = "224",
doi = "10.3390/chemosensors10060224"
}

Andrić, S., Jokić, I., Stevanović, J., Spasenović, M.,& Frantlović, M.. (2022). Noise Spectrum as a Source of Information in Gas Sensors Based on Liquid-Phase Exfoliated Graphene. in Chemosensors
MDPI AG., 10(6), 224.
https://doi.org/10.3390/chemosensors10060224

Andrić S, Jokić I, Stevanović J, Spasenović M, Frantlović M. Noise Spectrum as a Source of Information in Gas Sensors Based on Liquid-Phase Exfoliated Graphene. in Chemosensors. 2022;10(6):224.
doi:10.3390/chemosensors10060224 .

Andrić, Stevan, Jokić, Ivana, Stevanović, Jelena, Spasenović, Marko, Frantlović, Miloš, "Noise Spectrum as a Source of Information in Gas Sensors Based on Liquid-Phase Exfoliated Graphene" in Chemosensors, 10, no. 6 (2022):224,
https://doi.org/10.3390/chemosensors10060224 . .

TY  - JOUR
AU  - Vićentić, Teodora
AU  - Andrić, Stevan
AU  - Rajić, Vladimir
AU  - Spasenović, Marko
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5473
AB  - Electrochemical exfoliation is an efficient and scalable method to obtain liquid-phase graphene. Graphene in solution, obtained through electrochemical exfoliation or other methods, is typically polydisperse, containing particles of various sizes, which is not optimal for applications. We employed cascade centrifugation to select specific particle sizes in solution and prepared thin films from those graphene particles using the Langmuir–Blodgett assembly. Employing centrifugation speeds of 3, 4, and 5 krpm, further diluting the solutions in different volumes of solvent, we reliably and consistently obtained films of tunable thickness. We show that there is a limit to how thin these films can be, which is imposed by the percolation threshold. The percolation threshold is quantitatively compared to results found in literature that are obtained using other, more complex graphene film fabrication methods, and is found to occur with a percolation exponent and percolative figure of merit that are of the same order as results in literature. A maximum optical transparency of 82.4% at a wavelength of 660 nm is obtained for these films, which is in agreement with earlier works on Langmuir–Blodgett assembled ultrasonic-assisted liquid-phase exfoliated graphene. Our work demonstrates that films that are in all respects on par with films of graphene obtained through other solution-based processes can be produced from inexpensive and widely available centrifugal post-processing of existing commercially available solutions of electrochemically exfoliated graphene. The demonstrated methodology will lower the entry barriers for new research and industrial uses, since it allows researchers with no exfoliation experience to make use of widely available graphene materials.
PB  - Germany : Beilstein-Institut Zur Forderung der Chemischen Wissenschaften
T2  - Beilstein Journal of Nanotechnology
T1  - Reliable fabrication of transparent conducting films by cascade centrifugation and Langmuir–Blodgett deposition of electrochemically exfoliated graphene
VL  - 13
SP  - 666
EP  - 674
DO  - 10.3762/bjnano.13.58
ER  - 

@article{
author = "Vićentić, Teodora and Andrić, Stevan and Rajić, Vladimir and Spasenović, Marko",
year = "2022",
abstract = "Electrochemical exfoliation is an efficient and scalable method to obtain liquid-phase graphene. Graphene in solution, obtained through electrochemical exfoliation or other methods, is typically polydisperse, containing particles of various sizes, which is not optimal for applications. We employed cascade centrifugation to select specific particle sizes in solution and prepared thin films from those graphene particles using the Langmuir–Blodgett assembly. Employing centrifugation speeds of 3, 4, and 5 krpm, further diluting the solutions in different volumes of solvent, we reliably and consistently obtained films of tunable thickness. We show that there is a limit to how thin these films can be, which is imposed by the percolation threshold. The percolation threshold is quantitatively compared to results found in literature that are obtained using other, more complex graphene film fabrication methods, and is found to occur with a percolation exponent and percolative figure of merit that are of the same order as results in literature. A maximum optical transparency of 82.4% at a wavelength of 660 nm is obtained for these films, which is in agreement with earlier works on Langmuir–Blodgett assembled ultrasonic-assisted liquid-phase exfoliated graphene. Our work demonstrates that films that are in all respects on par with films of graphene obtained through other solution-based processes can be produced from inexpensive and widely available centrifugal post-processing of existing commercially available solutions of electrochemically exfoliated graphene. The demonstrated methodology will lower the entry barriers for new research and industrial uses, since it allows researchers with no exfoliation experience to make use of widely available graphene materials.",
publisher = "Germany : Beilstein-Institut Zur Forderung der Chemischen Wissenschaften",
journal = "Beilstein Journal of Nanotechnology",
title = "Reliable fabrication of transparent conducting films by cascade centrifugation and Langmuir–Blodgett deposition of electrochemically exfoliated graphene",
volume = "13",
pages = "666-674",
doi = "10.3762/bjnano.13.58"
}

Vićentić, T., Andrić, S., Rajić, V.,& Spasenović, M.. (2022). Reliable fabrication of transparent conducting films by cascade centrifugation and Langmuir–Blodgett deposition of electrochemically exfoliated graphene. in Beilstein Journal of Nanotechnology
Germany : Beilstein-Institut Zur Forderung der Chemischen Wissenschaften., 13, 666-674.
https://doi.org/10.3762/bjnano.13.58

Vićentić T, Andrić S, Rajić V, Spasenović M. Reliable fabrication of transparent conducting films by cascade centrifugation and Langmuir–Blodgett deposition of electrochemically exfoliated graphene. in Beilstein Journal of Nanotechnology. 2022;13:666-674.
doi:10.3762/bjnano.13.58 .

Vićentić, Teodora, Andrić, Stevan, Rajić, Vladimir, Spasenović, Marko, "Reliable fabrication of transparent conducting films by cascade centrifugation and Langmuir–Blodgett deposition of electrochemically exfoliated graphene" in Beilstein Journal of Nanotechnology, 13 (2022):666-674,
https://doi.org/10.3762/bjnano.13.58 . .

TY  - CONF
AU  - Bošković, Marko
AU  - Andrić, Stevan
AU  - Frantlović, Miloš
AU  - Jokić, Ivana
AU  - Sarajlić, Milija
AU  - Vićentić, Teodora
AU  - Spasenović, Marko
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7134
AB  - Herein we investigate the influence of UV irradiation on the time response of a resistive gas sensor with a liquid-phase exfoliated graphene as the active material. The effect of exposure to UV light on the baseline electrical resistance (in inert atmosphere) will be compared with the effect of the annealing process. The influence of various intensities of UV radiation on the response and recovery time, repeatability and detection limit of graphene will be discussed.
PB  - Serbian Academy of Sciences and Arts
C3  - Book of abstracts - PHOTONICA2021, VIII International School and Conference on Photonics & HEMMAGINERO workshop, 23 - 27 August 2021, Belgrade, Serbia
T1  - Influence of UV radiation on the time response of a resistive gas sensor based on liquid-phase exfoliated graphene
SP  - 180
EP  - 180
UR  - https://hdl.handle.net/21.15107/rcub_cer_7134
ER  - 

@conference{
author = "Bošković, Marko and Andrić, Stevan and Frantlović, Miloš and Jokić, Ivana and Sarajlić, Milija and Vićentić, Teodora and Spasenović, Marko",
year = "2021",
abstract = "Herein we investigate the influence of UV irradiation on the time response of a resistive gas sensor with a liquid-phase exfoliated graphene as the active material. The effect of exposure to UV light on the baseline electrical resistance (in inert atmosphere) will be compared with the effect of the annealing process. The influence of various intensities of UV radiation on the response and recovery time, repeatability and detection limit of graphene will be discussed.",
publisher = "Serbian Academy of Sciences and Arts",
journal = "Book of abstracts - PHOTONICA2021, VIII International School and Conference on Photonics & HEMMAGINERO workshop, 23 - 27 August 2021, Belgrade, Serbia",
title = "Influence of UV radiation on the time response of a resistive gas sensor based on liquid-phase exfoliated graphene",
pages = "180-180",
url = "https://hdl.handle.net/21.15107/rcub_cer_7134"
}

Bošković, M., Andrić, S., Frantlović, M., Jokić, I., Sarajlić, M., Vićentić, T.,& Spasenović, M.. (2021). Influence of UV radiation on the time response of a resistive gas sensor based on liquid-phase exfoliated graphene. in Book of abstracts - PHOTONICA2021, VIII International School and Conference on Photonics & HEMMAGINERO workshop, 23 - 27 August 2021, Belgrade, Serbia
Serbian Academy of Sciences and Arts., 180-180.
https://hdl.handle.net/21.15107/rcub_cer_7134

Bošković M, Andrić S, Frantlović M, Jokić I, Sarajlić M, Vićentić T, Spasenović M. Influence of UV radiation on the time response of a resistive gas sensor based on liquid-phase exfoliated graphene. in Book of abstracts - PHOTONICA2021, VIII International School and Conference on Photonics & HEMMAGINERO workshop, 23 - 27 August 2021, Belgrade, Serbia. 2021;:180-180.
https://hdl.handle.net/21.15107/rcub_cer_7134 .

Bošković, Marko, Andrić, Stevan, Frantlović, Miloš, Jokić, Ivana, Sarajlić, Milija, Vićentić, Teodora, Spasenović, Marko, "Influence of UV radiation on the time response of a resistive gas sensor based on liquid-phase exfoliated graphene" in Book of abstracts - PHOTONICA2021, VIII International School and Conference on Photonics & HEMMAGINERO workshop, 23 - 27 August 2021, Belgrade, Serbia (2021):180-180,
https://hdl.handle.net/21.15107/rcub_cer_7134 .

TY  - CONF
AU  - Spasenović, Marko
AU  - Andrić, Stevan
AU  - Tomašević-Ilić, Tijana
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4846
AB  - Gas sensors are an indispensable ingredient of the modern society, finding their use across a range of industries that include manufacturing, environmental protection and control, automotive and others. Novel applications have been arising, requiring new materials. Here we outline the principles of gas sensing with a focus on chemiresistive-type devices. We follow up with a summary of the advantages and use of graphene as a gas sensing material, discussing the properties of different graphene production methods. Finally, we showcase some recent results that point to novel applications of graphene-based gas sensors, including respiration monitoring and finger proximity detection.
PB  - Institute of Electrical and Electronics Engineers Inc
C3  - Proceedings - International Conference on Microelectronics, ICM32nd IEEE International Conference on Microelectronics, MIEL 2021
T1  - Graphene-based Chemiresistive Gas Sensors
SP  - 25
EP  - 28
DO  - 10.1109/MIEL52794.2021.9569192
ER  - 

@conference{
author = "Spasenović, Marko and Andrić, Stevan and Tomašević-Ilić, Tijana",
year = "2021",
abstract = "Gas sensors are an indispensable ingredient of the modern society, finding their use across a range of industries that include manufacturing, environmental protection and control, automotive and others. Novel applications have been arising, requiring new materials. Here we outline the principles of gas sensing with a focus on chemiresistive-type devices. We follow up with a summary of the advantages and use of graphene as a gas sensing material, discussing the properties of different graphene production methods. Finally, we showcase some recent results that point to novel applications of graphene-based gas sensors, including respiration monitoring and finger proximity detection.",
publisher = "Institute of Electrical and Electronics Engineers Inc",
journal = "Proceedings - International Conference on Microelectronics, ICM32nd IEEE International Conference on Microelectronics, MIEL 2021",
title = "Graphene-based Chemiresistive Gas Sensors",
pages = "25-28",
doi = "10.1109/MIEL52794.2021.9569192"
}

Spasenović, M., Andrić, S.,& Tomašević-Ilić, T.. (2021). Graphene-based Chemiresistive Gas Sensors. in Proceedings - International Conference on Microelectronics, ICM32nd IEEE International Conference on Microelectronics, MIEL 2021
Institute of Electrical and Electronics Engineers Inc., 25-28.
https://doi.org/10.1109/MIEL52794.2021.9569192

Spasenović M, Andrić S, Tomašević-Ilić T. Graphene-based Chemiresistive Gas Sensors. in Proceedings - International Conference on Microelectronics, ICM32nd IEEE International Conference on Microelectronics, MIEL 2021. 2021;:25-28.
doi:10.1109/MIEL52794.2021.9569192 .

Spasenović, Marko, Andrić, Stevan, Tomašević-Ilić, Tijana, "Graphene-based Chemiresistive Gas Sensors" in Proceedings - International Conference on Microelectronics, ICM32nd IEEE International Conference on Microelectronics, MIEL 2021 (2021):25-28,
https://doi.org/10.1109/MIEL52794.2021.9569192 . .

TY  - JOUR
AU  - Djurišić, Ivana
AU  - Dražić, Miloš S.
AU  - Tomović, Aleksandar Ž.
AU  - Spasenović, Marko
AU  - Šljivančanin, Željko
AU  - Jovanović, Vladimir P.
AU  - Zikić, Radomir
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4049
AB  - Single-molecule biosensing, with a promise of being applied in protein and DNA sequencing, could be achieved using tunneling current approach. Electrode-molecule-electrode tunneling current critically depends on whether molecular levels contribute to electronic transport or not. Here we found employing DFT and Non-Equilibrium Green's Function formalism that energies of benzene molecular levels placed between graphene electrodes are strongly influenced by electrode termination. Termination-dependent dipoles formed at the electrode ends induce in-gap field effect that is responsible for shifting of molecular levels. We show that the HOMO is closest to Fermi energy for nitrogen-terminated nanogaps (NtNGs) and nanopores (NtNPs), promoting them as strong candidates for single-molecule sensing applications.
PB  - Wiley
T2  - ChemPhysChem
T1  - Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene
VL  - 22
IS  - 3
SP  - 336
EP  - 341
DO  - 10.1002/cphc.202000771
ER  - 

@article{
author = "Djurišić, Ivana and Dražić, Miloš S. and Tomović, Aleksandar Ž. and Spasenović, Marko and Šljivančanin, Željko and Jovanović, Vladimir P. and Zikić, Radomir",
year = "2021",
abstract = "Single-molecule biosensing, with a promise of being applied in protein and DNA sequencing, could be achieved using tunneling current approach. Electrode-molecule-electrode tunneling current critically depends on whether molecular levels contribute to electronic transport or not. Here we found employing DFT and Non-Equilibrium Green's Function formalism that energies of benzene molecular levels placed between graphene electrodes are strongly influenced by electrode termination. Termination-dependent dipoles formed at the electrode ends induce in-gap field effect that is responsible for shifting of molecular levels. We show that the HOMO is closest to Fermi energy for nitrogen-terminated nanogaps (NtNGs) and nanopores (NtNPs), promoting them as strong candidates for single-molecule sensing applications.",
publisher = "Wiley",
journal = "ChemPhysChem",
title = "Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene",
volume = "22",
number = "3",
pages = "336-341",
doi = "10.1002/cphc.202000771"
}

Djurišić, I., Dražić, M. S., Tomović, A. Ž., Spasenović, M., Šljivančanin, Ž., Jovanović, V. P.,& Zikić, R.. (2021). Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene. in ChemPhysChem
Wiley., 22(3), 336-341.
https://doi.org/10.1002/cphc.202000771

Djurišić I, Dražić MS, Tomović AŽ, Spasenović M, Šljivančanin Ž, Jovanović VP, Zikić R. Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene. in ChemPhysChem. 2021;22(3):336-341.
doi:10.1002/cphc.202000771 .

Djurišić, Ivana, Dražić, Miloš S., Tomović, Aleksandar Ž., Spasenović, Marko, Šljivančanin, Željko, Jovanović, Vladimir P., Zikić, Radomir, "Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene" in ChemPhysChem, 22, no. 3 (2021):336-341,
https://doi.org/10.1002/cphc.202000771 . .

TY  - JOUR
AU  - Djurišić, Ivana
AU  - Dražić, Miloš S.
AU  - Tomović, Aleksandar Ž.
AU  - Spasenović, Marko
AU  - Šljivančanin, Željko
AU  - Jovanović, Vladimir P.
AU  - Zikić, Radomir
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4048
AB  - Functionalization of electrodes is a wide‐used strategy in various applications ranging from single‐molecule sensing and protein sequencing, to ion trapping, to desalination. We demonstrate, employing non‐equilibrium Green′s function formalism combined with density functional theory, that single‐species (N, H, S, Cl, F) termination of graphene nanogap electrodes results in a strong in‐gap electrostatic field, induced by species‐dependent dipoles formed at the electrode ends. Consequently, the field increases or decreases electronic transport through a molecule (benzene) placed in the nanogap by shifting molecular levels by almost 2 eV in respect to the electrode Fermi level via a field effect akin to the one used for field‐effect transistors. We also observed the local gating in graphene nanopores terminated with different single‐species atoms. Nitrogen‐terminated nanogaps (NtNGs) and nanopores (NtNPs) show the strongest effect. The in‐gap potential can be transformed from a plateau‐like to a saddle‐like shape by tailoring NtNG and NtNP size and termination type. In particular, the saddle‐like potential is applicable in single‐ion trapping and desalination devices.
PB  - Wiley
T2  - ChemPhysChem
T1  - Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene
VL  - 22
IS  - 3
SP  - 336
EP  - 341
DO  - 10.1002/cphc.202000771
ER  - 

@article{
author = "Djurišić, Ivana and Dražić, Miloš S. and Tomović, Aleksandar Ž. and Spasenović, Marko and Šljivančanin, Željko and Jovanović, Vladimir P. and Zikić, Radomir",
year = "2021",
abstract = "Functionalization of electrodes is a wide‐used strategy in various applications ranging from single‐molecule sensing and protein sequencing, to ion trapping, to desalination. We demonstrate, employing non‐equilibrium Green′s function formalism combined with density functional theory, that single‐species (N, H, S, Cl, F) termination of graphene nanogap electrodes results in a strong in‐gap electrostatic field, induced by species‐dependent dipoles formed at the electrode ends. Consequently, the field increases or decreases electronic transport through a molecule (benzene) placed in the nanogap by shifting molecular levels by almost 2 eV in respect to the electrode Fermi level via a field effect akin to the one used for field‐effect transistors. We also observed the local gating in graphene nanopores terminated with different single‐species atoms. Nitrogen‐terminated nanogaps (NtNGs) and nanopores (NtNPs) show the strongest effect. The in‐gap potential can be transformed from a plateau‐like to a saddle‐like shape by tailoring NtNG and NtNP size and termination type. In particular, the saddle‐like potential is applicable in single‐ion trapping and desalination devices.",
publisher = "Wiley",
journal = "ChemPhysChem",
title = "Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene",
volume = "22",
number = "3",
pages = "336-341",
doi = "10.1002/cphc.202000771"
}

Djurišić, I., Dražić, M. S., Tomović, A. Ž., Spasenović, M., Šljivančanin, Ž., Jovanović, V. P.,& Zikić, R.. (2021). Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene. in ChemPhysChem
Wiley., 22(3), 336-341.
https://doi.org/10.1002/cphc.202000771

Djurišić I, Dražić MS, Tomović AŽ, Spasenović M, Šljivančanin Ž, Jovanović VP, Zikić R. Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene. in ChemPhysChem. 2021;22(3):336-341.
doi:10.1002/cphc.202000771 .

Djurišić, Ivana, Dražić, Miloš S., Tomović, Aleksandar Ž., Spasenović, Marko, Šljivančanin, Željko, Jovanović, Vladimir P., Zikić, Radomir, "Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene" in ChemPhysChem, 22, no. 3 (2021):336-341,
https://doi.org/10.1002/cphc.202000771 . .

TY  - JOUR
AU  - Djurišić, Ivana
AU  - Dražić, Miloš S.
AU  - Tomović, Aleksandar Ž.
AU  - Spasenović, Marko
AU  - Šljivančanin, Željko
AU  - Jovanović, Vladimir P.
AU  - Zikić, Radomir
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4044
AB  - Functionalization of electrodes is a wide‐used strategy in various applications ranging from single‐molecule sensing and protein sequencing, to ion trapping, to desalination. We demonstrate, employing non‐equilibrium Green′s function formalism combined with density functional theory, that single‐species (N, H, S, Cl, F) termination of graphene nanogap electrodes results in a strong in‐gap electrostatic field, induced by species‐dependent dipoles formed at the electrode ends. Consequently, the field increases or decreases electronic transport through a molecule (benzene) placed in the nanogap by shifting molecular levels by almost 2 eV in respect to the electrode Fermi level via a field effect akin to the one used for field‐effect transistors. We also observed the local gating in graphene nanopores terminated with different single‐species atoms. Nitrogen‐terminated nanogaps (NtNGs) and nanopores (NtNPs) show the strongest effect. The in‐gap potential can be transformed from a plateau‐like to a saddle‐like shape by tailoring NtNG and NtNP size and termination type. In particular, the saddle‐like potential is applicable in single‐ion trapping and desalination devices.
PB  - Wiley
T2  - ChemPhysChem
T1  - Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene
VL  - 22
IS  - 3
SP  - 336
EP  - 341
DO  - 10.1002/cphc.202000771
ER  - 

@article{
author = "Djurišić, Ivana and Dražić, Miloš S. and Tomović, Aleksandar Ž. and Spasenović, Marko and Šljivančanin, Željko and Jovanović, Vladimir P. and Zikić, Radomir",
year = "2021",
abstract = "Functionalization of electrodes is a wide‐used strategy in various applications ranging from single‐molecule sensing and protein sequencing, to ion trapping, to desalination. We demonstrate, employing non‐equilibrium Green′s function formalism combined with density functional theory, that single‐species (N, H, S, Cl, F) termination of graphene nanogap electrodes results in a strong in‐gap electrostatic field, induced by species‐dependent dipoles formed at the electrode ends. Consequently, the field increases or decreases electronic transport through a molecule (benzene) placed in the nanogap by shifting molecular levels by almost 2 eV in respect to the electrode Fermi level via a field effect akin to the one used for field‐effect transistors. We also observed the local gating in graphene nanopores terminated with different single‐species atoms. Nitrogen‐terminated nanogaps (NtNGs) and nanopores (NtNPs) show the strongest effect. The in‐gap potential can be transformed from a plateau‐like to a saddle‐like shape by tailoring NtNG and NtNP size and termination type. In particular, the saddle‐like potential is applicable in single‐ion trapping and desalination devices.",
publisher = "Wiley",
journal = "ChemPhysChem",
title = "Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene",
volume = "22",
number = "3",
pages = "336-341",
doi = "10.1002/cphc.202000771"
}

Djurišić, I., Dražić, M. S., Tomović, A. Ž., Spasenović, M., Šljivančanin, Ž., Jovanović, V. P.,& Zikić, R.. (2021). Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene. in ChemPhysChem
Wiley., 22(3), 336-341.
https://doi.org/10.1002/cphc.202000771

Djurišić I, Dražić MS, Tomović AŽ, Spasenović M, Šljivančanin Ž, Jovanović VP, Zikić R. Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene. in ChemPhysChem. 2021;22(3):336-341.
doi:10.1002/cphc.202000771 .

Djurišić, Ivana, Dražić, Miloš S., Tomović, Aleksandar Ž., Spasenović, Marko, Šljivančanin, Željko, Jovanović, Vladimir P., Zikić, Radomir, "Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene" in ChemPhysChem, 22, no. 3 (2021):336-341,
https://doi.org/10.1002/cphc.202000771 . .

TY  - JOUR
AU  - Andrić, Stevan
AU  - Tomašević-Ilić, Tijana
AU  - Bošković, Marko V.
AU  - Sarajlić, Milija
AU  - Vasiljević-Radović, Dana
AU  - Smiljanić, Milče M.
AU  - Spasenović, Marko
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3993
AB  - Humidity sensing is important to a variety of technologies and industries, ranging from environmental and industrial monitoring to medical applications. Although humidity sensors abound, few available solutions are thin, transparent, compatible with large-area sensor production and flexible, and almost none are fast enough to perform human respiration monitoring through breath detection or real-time finger proximity monitoring via skin humidity sensing. This work describes chemiresistive graphene-based humidity sensors produced in few steps with facile liquid phase exfoliation followed by Langmuir–Blodgett assembly that enables active areas of practically any size. The graphene sensors provide a unique mix of performance parameters, exhibiting resistance changes up to 10% with varying humidity, linear performance over relative humidity (RH) levels between 8% and 95%, weak response to other constituents of air, flexibility, transparency of nearly 80%, and response times of 30 ms. The fast response to humidity is shown to be useful for respiration monitoring and real-time finger proximity detection, with potential applications in flexible touchless interactive panels.
PB  - IOP Publishing
T2  - Nanotechnology
T1  - Ultrafast humidity sensor based on liquid phase exfoliated graphene
VL  - 32
IS  - 2
SP  - 025505
DO  - 10.1088/1361-6528/abb973
ER  - 

@article{
author = "Andrić, Stevan and Tomašević-Ilić, Tijana and Bošković, Marko V. and Sarajlić, Milija and Vasiljević-Radović, Dana and Smiljanić, Milče M. and Spasenović, Marko",
year = "2020",
abstract = "Humidity sensing is important to a variety of technologies and industries, ranging from environmental and industrial monitoring to medical applications. Although humidity sensors abound, few available solutions are thin, transparent, compatible with large-area sensor production and flexible, and almost none are fast enough to perform human respiration monitoring through breath detection or real-time finger proximity monitoring via skin humidity sensing. This work describes chemiresistive graphene-based humidity sensors produced in few steps with facile liquid phase exfoliation followed by Langmuir–Blodgett assembly that enables active areas of practically any size. The graphene sensors provide a unique mix of performance parameters, exhibiting resistance changes up to 10% with varying humidity, linear performance over relative humidity (RH) levels between 8% and 95%, weak response to other constituents of air, flexibility, transparency of nearly 80%, and response times of 30 ms. The fast response to humidity is shown to be useful for respiration monitoring and real-time finger proximity detection, with potential applications in flexible touchless interactive panels.",
publisher = "IOP Publishing",
journal = "Nanotechnology",
title = "Ultrafast humidity sensor based on liquid phase exfoliated graphene",
volume = "32",
number = "2",
pages = "025505",
doi = "10.1088/1361-6528/abb973"
}

Andrić, S., Tomašević-Ilić, T., Bošković, M. V., Sarajlić, M., Vasiljević-Radović, D., Smiljanić, M. M.,& Spasenović, M.. (2020). Ultrafast humidity sensor based on liquid phase exfoliated graphene. in Nanotechnology
IOP Publishing., 32(2), 025505.
https://doi.org/10.1088/1361-6528/abb973

Andrić S, Tomašević-Ilić T, Bošković MV, Sarajlić M, Vasiljević-Radović D, Smiljanić MM, Spasenović M. Ultrafast humidity sensor based on liquid phase exfoliated graphene. in Nanotechnology. 2020;32(2):025505.
doi:10.1088/1361-6528/abb973 .

Andrić, Stevan, Tomašević-Ilić, Tijana, Bošković, Marko V., Sarajlić, Milija, Vasiljević-Radović, Dana, Smiljanić, Milče M., Spasenović, Marko, "Ultrafast humidity sensor based on liquid phase exfoliated graphene" in Nanotechnology, 32, no. 2 (2020):025505,
https://doi.org/10.1088/1361-6528/abb973 . .

TY  - JOUR
AU  - Jakšić, Olga
AU  - Spasenović, Marko
AU  - Jakšić, Zoran
AU  - Vasiljević-Radović, Dana
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4008
AB  - Surface density of adsorption sites on an adsorbent (including affinity-based sensors) is one
of the basic input parameters in modeling of process kinetics in adsorption based devices. Yet, there is
no simple expression suitable for fast calculations in current multiscale models. The published
experimental data are often application-specific and related to the equilibrium surface density of
adsorbate molecules. Based on the known density of adsorbed gas molecules and the surface coverage,
both of these in equilibrium, we obtained an equation for the surface density of adsorption sites.
We applied our analysis to the case of pristine graphene and thus estimated molecular dynamics of
adsorption on it. The monolayer coverage was determined for various pressures and temperatures.
The results are verified by comparison with literature data. The results may be applicable to modeling
of the surface density of adsorption sites for gas adsorption on other homogeneous crystallographic
surfaces. In addition to it, the obtained analytical expressions are suitable for training artificial
neural networks determining the surface density of adsorption sites on a graphene surface based
on the known binding energy, temperature, mass of adsorbate molecules and their affinity towards
graphene. The latter is of interest for multiscale modelling.
PB  - MDPI
T2  - Surfaces
T1  - Monolayer Gas Adsorption on Graphene-Based Materials: Surface Density of Adsorption Sites and Adsorption Capacity
VL  - 3
IS  - 3
SP  - 423
EP  - 432
DO  - 10.3390/surfaces3030031
ER  - 

@article{
author = "Jakšić, Olga and Spasenović, Marko and Jakšić, Zoran and Vasiljević-Radović, Dana",
year = "2020",
abstract = "Surface density of adsorption sites on an adsorbent (including affinity-based sensors) is one
of the basic input parameters in modeling of process kinetics in adsorption based devices. Yet, there is
no simple expression suitable for fast calculations in current multiscale models. The published
experimental data are often application-specific and related to the equilibrium surface density of
adsorbate molecules. Based on the known density of adsorbed gas molecules and the surface coverage,
both of these in equilibrium, we obtained an equation for the surface density of adsorption sites.
We applied our analysis to the case of pristine graphene and thus estimated molecular dynamics of
adsorption on it. The monolayer coverage was determined for various pressures and temperatures.
The results are verified by comparison with literature data. The results may be applicable to modeling
of the surface density of adsorption sites for gas adsorption on other homogeneous crystallographic
surfaces. In addition to it, the obtained analytical expressions are suitable for training artificial
neural networks determining the surface density of adsorption sites on a graphene surface based
on the known binding energy, temperature, mass of adsorbate molecules and their affinity towards
graphene. The latter is of interest for multiscale modelling.",
publisher = "MDPI",
journal = "Surfaces",
title = "Monolayer Gas Adsorption on Graphene-Based Materials: Surface Density of Adsorption Sites and Adsorption Capacity",
volume = "3",
number = "3",
pages = "423-432",
doi = "10.3390/surfaces3030031"
}

Jakšić, O., Spasenović, M., Jakšić, Z.,& Vasiljević-Radović, D.. (2020). Monolayer Gas Adsorption on Graphene-Based Materials: Surface Density of Adsorption Sites and Adsorption Capacity. in Surfaces
MDPI., 3(3), 423-432.
https://doi.org/10.3390/surfaces3030031

Jakšić O, Spasenović M, Jakšić Z, Vasiljević-Radović D. Monolayer Gas Adsorption on Graphene-Based Materials: Surface Density of Adsorption Sites and Adsorption Capacity. in Surfaces. 2020;3(3):423-432.
doi:10.3390/surfaces3030031 .

Jakšić, Olga, Spasenović, Marko, Jakšić, Zoran, Vasiljević-Radović, Dana, "Monolayer Gas Adsorption on Graphene-Based Materials: Surface Density of Adsorption Sites and Adsorption Capacity" in Surfaces, 3, no. 3 (2020):423-432,
https://doi.org/10.3390/surfaces3030031 . .