TY  - JOUR
AU  - Stevanović, Jelena
AU  - Petrović, Srđan
AU  - Tadić, Nenad
AU  - Cvetanović, Katarina
AU  - Silva, Ana G.
AU  - Vasiljević-Radović, Dana
AU  - Sarajlić, Milija
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5809
AB  - TiO2 and CeO2 are well known as oxygen sensing materials. Despite high sensitivity, the actual utilization of these materials in gas detection remains limited. Research conducted over the last two decades has revealed synergistic effects of TiO2-CeO2 mixed oxides that have the potential to improve some aspects of oxygen monitoring. However, there are no studies on the sensing properties of the TiO2-CeO2 obtained by mechanochemical treatment. We have tested the applicability of the mechanochemically treated TiO2-CeO2 for oxygen detection and presented the results in this study. The sensing layers are prepared as a porous structure by screen printing a thick film on a commercial substrate. The obtained structures were exposed to various O2 concentrations. The results of electrical measurements showed that TiO2-CeO2 films have a significantly lower resistance than pure oxide films. Mixtures of composition TiO2:CeO2 = 0.8:0.2, ground for 100 min, have the lowest electrical resistance among the tested materials. Mixtures of composition TiO2:CeO2 = 0.5:0.5 and ground for 100 min proved to be the most sensitive. The operating temperature can be as low as 320 °C, which places this sensor in the class of semiconductor sensors working at relatively lower temperatures.
PB  - Switzerland : Multidisciplinary Digital Publishing Institute (MDPI)
T2  - Sensors
T1  - Mechanochemical Synthesis of TiO2-CeO2 Mixed Oxides Utilized as a Screen-Printed Sensing Material for Oxygen Sensor
VL  - 23
IS  - 3
SP  - 1313
DO  - 10.3390/s23031313
ER  - 

@article{
author = "Stevanović, Jelena and Petrović, Srđan and Tadić, Nenad and Cvetanović, Katarina and Silva, Ana G. and Vasiljević-Radović, Dana and Sarajlić, Milija",
year = "2023",
abstract = "TiO2 and CeO2 are well known as oxygen sensing materials. Despite high sensitivity, the actual utilization of these materials in gas detection remains limited. Research conducted over the last two decades has revealed synergistic effects of TiO2-CeO2 mixed oxides that have the potential to improve some aspects of oxygen monitoring. However, there are no studies on the sensing properties of the TiO2-CeO2 obtained by mechanochemical treatment. We have tested the applicability of the mechanochemically treated TiO2-CeO2 for oxygen detection and presented the results in this study. The sensing layers are prepared as a porous structure by screen printing a thick film on a commercial substrate. The obtained structures were exposed to various O2 concentrations. The results of electrical measurements showed that TiO2-CeO2 films have a significantly lower resistance than pure oxide films. Mixtures of composition TiO2:CeO2 = 0.8:0.2, ground for 100 min, have the lowest electrical resistance among the tested materials. Mixtures of composition TiO2:CeO2 = 0.5:0.5 and ground for 100 min proved to be the most sensitive. The operating temperature can be as low as 320 °C, which places this sensor in the class of semiconductor sensors working at relatively lower temperatures.",
publisher = "Switzerland : Multidisciplinary Digital Publishing Institute (MDPI)",
journal = "Sensors",
title = "Mechanochemical Synthesis of TiO2-CeO2 Mixed Oxides Utilized as a Screen-Printed Sensing Material for Oxygen Sensor",
volume = "23",
number = "3",
pages = "1313",
doi = "10.3390/s23031313"
}

Stevanović, J., Petrović, S., Tadić, N., Cvetanović, K., Silva, A. G., Vasiljević-Radović, D.,& Sarajlić, M.. (2023). Mechanochemical Synthesis of TiO2-CeO2 Mixed Oxides Utilized as a Screen-Printed Sensing Material for Oxygen Sensor. in Sensors
Switzerland : Multidisciplinary Digital Publishing Institute (MDPI)., 23(3), 1313.
https://doi.org/10.3390/s23031313

Stevanović J, Petrović S, Tadić N, Cvetanović K, Silva AG, Vasiljević-Radović D, Sarajlić M. Mechanochemical Synthesis of TiO2-CeO2 Mixed Oxides Utilized as a Screen-Printed Sensing Material for Oxygen Sensor. in Sensors. 2023;23(3):1313.
doi:10.3390/s23031313 .

Stevanović, Jelena, Petrović, Srđan, Tadić, Nenad, Cvetanović, Katarina, Silva, Ana G., Vasiljević-Radović, Dana, Sarajlić, Milija, "Mechanochemical Synthesis of TiO2-CeO2 Mixed Oxides Utilized as a Screen-Printed Sensing Material for Oxygen Sensor" in Sensors, 23, no. 3 (2023):1313,
https://doi.org/10.3390/s23031313 . .

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  - 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  - 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 .