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  - 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  - 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  - 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  - CONF
AU  - Andrić, Stevan
AU  - Tomašević-Ilić, Tijana
AU  - Sarajlić, Milija
AU  - Lazić, Žarko
AU  - Cvetanović-Zobenica, Katarina
AU  - Rašljić, Milena
AU  - Smiljanić, Milče
AU  - Spasenović, Marko
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7421
AB  - Chemical sensors are an enabling tool across many industries, including the largest ones such as  energy, transport, and construction. Low-cost, high performance sensors, especially ones compatible  with flexible substrates, are becoming increasingly important with the development of mobile  gadgets and wearable devices. Here we show humidity sensors produced from thin films of graphene  exfoliated in the liquid phase and deposited with Langmuir-Blodgett assembly. The films are formed  from connected nanoflakes that are ~120nm in diameter and ~10 layers thick. We show that such  films have an abundancy of reactive edges that act as binding sites for gas detection, enabling high  sensitivity to gas presence [1]. The method that we demonstrate uses low-cost processes, is highly  scalable and consistently yields films of high quality that can be deposited on any substrate, including flexible and transparent ones. We produce our thin films on top of a Si/SiO2 wafer with four contacts for measuring sheet resistance in real time as gas is introduced. The sensors that we make are more sensitive to humidity than ones demonstrated with CVD graphene [2], with up to 30% change in sheet resistance upon exposure to water vapor. Although we demonstrate detection of humidity, the same sensors can be used to detect other, both toxic and non-toxic gases.
PB  - Spain : Phantoms Foundation
PB  - France : Université de Strasbrourg / CNRS
PB  - Germany : TU Dresden / cfaed
C3  - European conference on chemistry of two-dimensional materials, Chem2Dmat - 2019, September 03-06, Dresden, Germany
T1  - Humidity sensing with Langmuir-Blodgett assembled  graphene films from liquid phase
SP  - 116
EP  - 116
UR  - https://hdl.handle.net/21.15107/rcub_cer_7421
ER  - 

@conference{
author = "Andrić, Stevan and Tomašević-Ilić, Tijana and Sarajlić, Milija and Lazić, Žarko and Cvetanović-Zobenica, Katarina and Rašljić, Milena and Smiljanić, Milče and Spasenović, Marko",
year = "2019",
abstract = "Chemical sensors are an enabling tool across many industries, including the largest ones such as  energy, transport, and construction. Low-cost, high performance sensors, especially ones compatible  with flexible substrates, are becoming increasingly important with the development of mobile  gadgets and wearable devices. Here we show humidity sensors produced from thin films of graphene  exfoliated in the liquid phase and deposited with Langmuir-Blodgett assembly. The films are formed  from connected nanoflakes that are ~120nm in diameter and ~10 layers thick. We show that such  films have an abundancy of reactive edges that act as binding sites for gas detection, enabling high  sensitivity to gas presence [1]. The method that we demonstrate uses low-cost processes, is highly  scalable and consistently yields films of high quality that can be deposited on any substrate, including flexible and transparent ones. We produce our thin films on top of a Si/SiO2 wafer with four contacts for measuring sheet resistance in real time as gas is introduced. The sensors that we make are more sensitive to humidity than ones demonstrated with CVD graphene [2], with up to 30% change in sheet resistance upon exposure to water vapor. Although we demonstrate detection of humidity, the same sensors can be used to detect other, both toxic and non-toxic gases.",
publisher = "Spain : Phantoms Foundation, France : Université de Strasbrourg / CNRS, Germany : TU Dresden / cfaed",
journal = "European conference on chemistry of two-dimensional materials, Chem2Dmat - 2019, September 03-06, Dresden, Germany",
title = "Humidity sensing with Langmuir-Blodgett assembled  graphene films from liquid phase",
pages = "116-116",
url = "https://hdl.handle.net/21.15107/rcub_cer_7421"
}

Andrić, S., Tomašević-Ilić, T., Sarajlić, M., Lazić, Ž., Cvetanović-Zobenica, K., Rašljić, M., Smiljanić, M.,& Spasenović, M.. (2019). Humidity sensing with Langmuir-Blodgett assembled  graphene films from liquid phase. in European conference on chemistry of two-dimensional materials, Chem2Dmat - 2019, September 03-06, Dresden, Germany
Spain : Phantoms Foundation., 116-116.
https://hdl.handle.net/21.15107/rcub_cer_7421

Andrić S, Tomašević-Ilić T, Sarajlić M, Lazić Ž, Cvetanović-Zobenica K, Rašljić M, Smiljanić M, Spasenović M. Humidity sensing with Langmuir-Blodgett assembled  graphene films from liquid phase. in European conference on chemistry of two-dimensional materials, Chem2Dmat - 2019, September 03-06, Dresden, Germany. 2019;:116-116.
https://hdl.handle.net/21.15107/rcub_cer_7421 .

Andrić, Stevan, Tomašević-Ilić, Tijana, Sarajlić, Milija, Lazić, Žarko, Cvetanović-Zobenica, Katarina, Rašljić, Milena, Smiljanić, Milče, Spasenović, Marko, "Humidity sensing with Langmuir-Blodgett assembled  graphene films from liquid phase" in European conference on chemistry of two-dimensional materials, Chem2Dmat - 2019, September 03-06, Dresden, Germany (2019):116-116,
https://hdl.handle.net/21.15107/rcub_cer_7421 .