TY  - JOUR
AU  - Huskić, Miroslav
AU  - Kepić, Dejan
AU  - Kleut, Duška
AU  - Mozetič, Miran
AU  - Vesel, Alenka
AU  - Anžlovar, Alojz
AU  - Bajuk Bogdanović, Danica
AU  - Jovanović, Svetlana
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12874
AB  - The present study focuses on correlations between three parameters: (1) graphite particle
size, (2) the ratio of graphite to oxidizing agent (KMnO4
), and (3) the ratio of graphite to acid
(H2SO4 and H3PO4
), with the reaction yield, structure, and properties of graphene oxide (GO). The
correlations are a challenge, as these three parameters can hardly be separated from each other due to
the variations in the viscosity of the system. The larger the graphite particles, the higher the viscosity
of GO. Decreasing the ratio of graphite to KMnO4
from 1:4 to 1:6 generally leads to a higher degree
of oxidation and a higher reaction yield. However, the differences are very small. Increasing the
graphite-to-acid-volume ratio from 1 g/60 mL to 1 g/80 mL, except for the smallest particles, reduced
the degree of oxidation and slightly reduced the reaction yield. However, the reaction yield mainly
depends on the extent of purification of GO by water, not on the reaction conditions. The large
differences in the thermal decomposition of GO are mainly due to the bulk particle size and less to
other parameters
T2  - Nanomaterials
T1  - The Influence of Reaction Conditions on the Properties of Graphene Oxide
VL  - 14
IS  - 3
SP  - 281
DO  - 10.3390/nano14030281
ER  - 

@article{
author = "Huskić, Miroslav and Kepić, Dejan and Kleut, Duška and Mozetič, Miran and Vesel, Alenka and Anžlovar, Alojz and Bajuk Bogdanović, Danica and Jovanović, Svetlana",
year = "2024",
abstract = "The present study focuses on correlations between three parameters: (1) graphite particle
size, (2) the ratio of graphite to oxidizing agent (KMnO4
), and (3) the ratio of graphite to acid
(H2SO4 and H3PO4
), with the reaction yield, structure, and properties of graphene oxide (GO). The
correlations are a challenge, as these three parameters can hardly be separated from each other due to
the variations in the viscosity of the system. The larger the graphite particles, the higher the viscosity
of GO. Decreasing the ratio of graphite to KMnO4
from 1:4 to 1:6 generally leads to a higher degree
of oxidation and a higher reaction yield. However, the differences are very small. Increasing the
graphite-to-acid-volume ratio from 1 g/60 mL to 1 g/80 mL, except for the smallest particles, reduced
the degree of oxidation and slightly reduced the reaction yield. However, the reaction yield mainly
depends on the extent of purification of GO by water, not on the reaction conditions. The large
differences in the thermal decomposition of GO are mainly due to the bulk particle size and less to
other parameters",
journal = "Nanomaterials",
title = "The Influence of Reaction Conditions on the Properties of Graphene Oxide",
volume = "14",
number = "3",
pages = "281",
doi = "10.3390/nano14030281"
}

Huskić, M., Kepić, D., Kleut, D., Mozetič, M., Vesel, A., Anžlovar, A., Bajuk Bogdanović, D.,& Jovanović, S.. (2024). The Influence of Reaction Conditions on the Properties of Graphene Oxide. in Nanomaterials, 14(3), 281.
https://doi.org/10.3390/nano14030281

Huskić M, Kepić D, Kleut D, Mozetič M, Vesel A, Anžlovar A, Bajuk Bogdanović D, Jovanović S. The Influence of Reaction Conditions on the Properties of Graphene Oxide. in Nanomaterials. 2024;14(3):281.
doi:10.3390/nano14030281 .

Huskić, Miroslav, Kepić, Dejan, Kleut, Duška, Mozetič, Miran, Vesel, Alenka, Anžlovar, Alojz, Bajuk Bogdanović, Danica, Jovanović, Svetlana, "The Influence of Reaction Conditions on the Properties of Graphene Oxide" in Nanomaterials, 14, no. 3 (2024):281,
https://doi.org/10.3390/nano14030281 . .

TY  - CONF
AU  - Davidović, Miloš
AU  - Kleut, Duška
AU  - Davidović, Milena D.
AU  - Stojanović, Danka B.
AU  - Jovašević-Stojanović, Milena
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/13046
AB  - Atmospheric aerosols in urban areas typically consist of particles of different diameters, which can range in size from a few nanometers to a few micrometers and can have a strong impact on human health [1,2]. This motivates the need to measure aerosol concentration accurately, but it is often also necessary to combine results from several instruments, with fundamentally different measurement principles. In this work, methods based on the measurement of the electrical mobility of particles, for the range of diameters from 10nm to 420nm, and the measurement of the equivalent optical diameter, for the range of diameters from 300nm to 10um, were used. Combining the overlapping region in two size distribution spectra can be used to infer equivalent optical properties of the ambient aerosol, and examples of measured and combined spectra in several urban hot spots in Bay of Kotor are analyzed in some detail. These examples will illustrate several aspects of urban aerosol properties not readily available in a typical regulatory monitoring setting, such as distribution of modes in number and mass concentration, as well as optical properties of measured aerosol.  As the main result, examples of combining particle size spectrums are presented. In the process of combining the particle size spectra, it is possible to modify the distribution obtained by optical measurements by searching for the optimal value of the refractive index of the particles to obtain the best possible agreement with the size distribution obtained by measuring the electrical mobility. An equivalent refractive index as well as the equivalent shape factor of the ambient aerosol is obtained using Mie scattering theory as a theoretical framework [3]. The measurement results from the mobile monitoring campaign in Bay of Kotor in 2017 were used to elucidate the main principles of size spectrum combination, as well as to showcase diversity of equivalent optical properties of urban aerosols.
PB  - Belgrade : Institute of Physics
C3  - 16th Photonics Workshop : Book of abstracts
T1  - Combining size distribution spectrums of ambient aerosols using equivalent optical properties of nanosized particles – selected examples from the Bay of Kotor
SP  - 26
EP  - 26
UR  - https://hdl.handle.net/21.15107/rcub_vinar_13046
ER  - 

@conference{
author = "Davidović, Miloš and Kleut, Duška and Davidović, Milena D. and Stojanović, Danka B. and Jovašević-Stojanović, Milena",
year = "2023",
abstract = "Atmospheric aerosols in urban areas typically consist of particles of different diameters, which can range in size from a few nanometers to a few micrometers and can have a strong impact on human health [1,2]. This motivates the need to measure aerosol concentration accurately, but it is often also necessary to combine results from several instruments, with fundamentally different measurement principles. In this work, methods based on the measurement of the electrical mobility of particles, for the range of diameters from 10nm to 420nm, and the measurement of the equivalent optical diameter, for the range of diameters from 300nm to 10um, were used. Combining the overlapping region in two size distribution spectra can be used to infer equivalent optical properties of the ambient aerosol, and examples of measured and combined spectra in several urban hot spots in Bay of Kotor are analyzed in some detail. These examples will illustrate several aspects of urban aerosol properties not readily available in a typical regulatory monitoring setting, such as distribution of modes in number and mass concentration, as well as optical properties of measured aerosol.  As the main result, examples of combining particle size spectrums are presented. In the process of combining the particle size spectra, it is possible to modify the distribution obtained by optical measurements by searching for the optimal value of the refractive index of the particles to obtain the best possible agreement with the size distribution obtained by measuring the electrical mobility. An equivalent refractive index as well as the equivalent shape factor of the ambient aerosol is obtained using Mie scattering theory as a theoretical framework [3]. The measurement results from the mobile monitoring campaign in Bay of Kotor in 2017 were used to elucidate the main principles of size spectrum combination, as well as to showcase diversity of equivalent optical properties of urban aerosols.",
publisher = "Belgrade : Institute of Physics",
journal = "16th Photonics Workshop : Book of abstracts",
title = "Combining size distribution spectrums of ambient aerosols using equivalent optical properties of nanosized particles – selected examples from the Bay of Kotor",
pages = "26-26",
url = "https://hdl.handle.net/21.15107/rcub_vinar_13046"
}

Davidović, M., Kleut, D., Davidović, M. D., Stojanović, D. B.,& Jovašević-Stojanović, M.. (2023). Combining size distribution spectrums of ambient aerosols using equivalent optical properties of nanosized particles – selected examples from the Bay of Kotor. in 16th Photonics Workshop : Book of abstracts
Belgrade : Institute of Physics., 26-26.
https://hdl.handle.net/21.15107/rcub_vinar_13046

Davidović M, Kleut D, Davidović MD, Stojanović DB, Jovašević-Stojanović M. Combining size distribution spectrums of ambient aerosols using equivalent optical properties of nanosized particles – selected examples from the Bay of Kotor. in 16th Photonics Workshop : Book of abstracts. 2023;:26-26.
https://hdl.handle.net/21.15107/rcub_vinar_13046 .

Davidović, Miloš, Kleut, Duška, Davidović, Milena D., Stojanović, Danka B., Jovašević-Stojanović, Milena, "Combining size distribution spectrums of ambient aerosols using equivalent optical properties of nanosized particles – selected examples from the Bay of Kotor" in 16th Photonics Workshop : Book of abstracts (2023):26-26,
https://hdl.handle.net/21.15107/rcub_vinar_13046 .

TY  - CONF
AU  - Stojanović, Danka B.
AU  - Kleut, Duška
AU  - Davidović, Miloš
AU  - Lepioufle, Jean-Marie
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/13047
AB  - Particulate matter (PM) in air has been proven to be hazardous to human health. Until recently, monitoring of air quality has been done by professional agencies. Nowadays, the availability of portable, low cost microsensor devices and the exponential growth of IoT (Internet of Things) in everyday life has enabled widespread monitoring of air quality among all citizens.[1]. For PM measurements, optical sensors measure light scattering by particles carried in an air stream through a light beam, which is converted by computation to equivalent mass concentration. Light scattering is strongly affected by parameters such as particle density, particle hygroscopicity, refraction index, and particle composition [2]. In this study, we measured PM 2.5 by seven AQ MESH low-cost optical sensors and compared the measured data with the ones obtained from the reference monitoring station (SEPA). Could we, by a sequence of low-processing data enrichment and a simple calibration method, reach an accuracy as close as a calibration based on machine learning? To answer this question, we used low-processing data enrichment such as resampling, encoding periodic timerelated features and making a composition of the initial low-cost signal at different time scales. We compared two algorithms for the calibration: multivariate linear regression and random forest. The results gave promising results and encouraged us in researching further about signal low-processing to achieve the required quality of data from low-cost sensor devices monitoring air quality [3].
PB  - Belgrade : Institute of Physics
C3  - 16th Photonics Workshop : Book of abstracts
T1  - Data enrichment and calibration for PM 2.5 low-cost optical sensors
SP  - 40
EP  - 40
UR  - https://hdl.handle.net/21.15107/rcub_vinar_13047
ER  - 

@conference{
author = "Stojanović, Danka B. and Kleut, Duška and Davidović, Miloš and Lepioufle, Jean-Marie",
year = "2023",
abstract = "Particulate matter (PM) in air has been proven to be hazardous to human health. Until recently, monitoring of air quality has been done by professional agencies. Nowadays, the availability of portable, low cost microsensor devices and the exponential growth of IoT (Internet of Things) in everyday life has enabled widespread monitoring of air quality among all citizens.[1]. For PM measurements, optical sensors measure light scattering by particles carried in an air stream through a light beam, which is converted by computation to equivalent mass concentration. Light scattering is strongly affected by parameters such as particle density, particle hygroscopicity, refraction index, and particle composition [2]. In this study, we measured PM 2.5 by seven AQ MESH low-cost optical sensors and compared the measured data with the ones obtained from the reference monitoring station (SEPA). Could we, by a sequence of low-processing data enrichment and a simple calibration method, reach an accuracy as close as a calibration based on machine learning? To answer this question, we used low-processing data enrichment such as resampling, encoding periodic timerelated features and making a composition of the initial low-cost signal at different time scales. We compared two algorithms for the calibration: multivariate linear regression and random forest. The results gave promising results and encouraged us in researching further about signal low-processing to achieve the required quality of data from low-cost sensor devices monitoring air quality [3].",
publisher = "Belgrade : Institute of Physics",
journal = "16th Photonics Workshop : Book of abstracts",
title = "Data enrichment and calibration for PM 2.5 low-cost optical sensors",
pages = "40-40",
url = "https://hdl.handle.net/21.15107/rcub_vinar_13047"
}

Stojanović, D. B., Kleut, D., Davidović, M.,& Lepioufle, J.. (2023). Data enrichment and calibration for PM 2.5 low-cost optical sensors. in 16th Photonics Workshop : Book of abstracts
Belgrade : Institute of Physics., 40-40.
https://hdl.handle.net/21.15107/rcub_vinar_13047

Stojanović DB, Kleut D, Davidović M, Lepioufle J. Data enrichment and calibration for PM 2.5 low-cost optical sensors. in 16th Photonics Workshop : Book of abstracts. 2023;:40-40.
https://hdl.handle.net/21.15107/rcub_vinar_13047 .

Stojanović, Danka B., Kleut, Duška, Davidović, Miloš, Lepioufle, Jean-Marie, "Data enrichment and calibration for PM 2.5 low-cost optical sensors" in 16th Photonics Workshop : Book of abstracts (2023):40-40,
https://hdl.handle.net/21.15107/rcub_vinar_13047 .

TY  - JOUR
AU  - De Vito, Saverio
AU  - D’Elia, Gerardo
AU  - Ferlito, Sergio
AU  - Di Francia, Girolamo
AU  - Davidović, Miloš
AU  - Kleut, Duška
AU  - Stojanović, Danka
AU  - Jovašević-Stojanović, Milena
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12046
AB  - Scalable and effective calibration is a fundamental requirement for Low Cost Air Quality Monitoring Systems and will enable accurate and pervasive monitoring in cities. Suffering from environmental interferences and fabrication variance, these devices need to encompass sensors specific and complex calibration processes for reaching a sufficient accuracy to be deployed as indicative measurement devices in Air Quality (AQ) monitoring networks. Concept and sensor drift often force calibration process to be frequently repeated. These issues lead to unbearable calibration costs which denies their massive deployment when accuracy is a concern. In this work, We propose a zero transfer samples, global calibration methodology as a technological enabler for IoT AQ multisensory devices which relies on low cost Particulate Matter (PM) sensors. This methodology is based on field recorded responses from a limited number of IoT AQ multisensors units and machine learning concepts and can be universally applied to all units of the same type. A multi season test campaign shown that, when applied to different sensors, this methodology performances match those of state of the art methodology which requires to derive different calibration parameters for each different unit. If confirmed, these results show that, when properly derived, a global calibration law can be exploited for a large number of networked devices with dramatic cost reduction eventually allowing massive deployment of accurate IoT AQ monitoring devices. Furthermore, this calibration model could be easily embedded on board of the device or implemented on the edge allowing immediate access to accurate readings for personal exposure monitor applications as well as reducing long range data transfer needs.
T2  - IEEE Transactions on Instrumentation and Measurement
T1  - A Global Multi-Unit Calibration as a Method for Large Scale IoT Particulate Matter Monitoring Systems Deployments
SP  - 1
EP  - 1
DO  - 10.1109/TIM.2023.3331428
ER  - 

@article{
author = "De Vito, Saverio and D’Elia, Gerardo and Ferlito, Sergio and Di Francia, Girolamo and Davidović, Miloš and Kleut, Duška and Stojanović, Danka and Jovašević-Stojanović, Milena",
year = "2023",
abstract = "Scalable and effective calibration is a fundamental requirement for Low Cost Air Quality Monitoring Systems and will enable accurate and pervasive monitoring in cities. Suffering from environmental interferences and fabrication variance, these devices need to encompass sensors specific and complex calibration processes for reaching a sufficient accuracy to be deployed as indicative measurement devices in Air Quality (AQ) monitoring networks. Concept and sensor drift often force calibration process to be frequently repeated. These issues lead to unbearable calibration costs which denies their massive deployment when accuracy is a concern. In this work, We propose a zero transfer samples, global calibration methodology as a technological enabler for IoT AQ multisensory devices which relies on low cost Particulate Matter (PM) sensors. This methodology is based on field recorded responses from a limited number of IoT AQ multisensors units and machine learning concepts and can be universally applied to all units of the same type. A multi season test campaign shown that, when applied to different sensors, this methodology performances match those of state of the art methodology which requires to derive different calibration parameters for each different unit. If confirmed, these results show that, when properly derived, a global calibration law can be exploited for a large number of networked devices with dramatic cost reduction eventually allowing massive deployment of accurate IoT AQ monitoring devices. Furthermore, this calibration model could be easily embedded on board of the device or implemented on the edge allowing immediate access to accurate readings for personal exposure monitor applications as well as reducing long range data transfer needs.",
journal = "IEEE Transactions on Instrumentation and Measurement",
title = "A Global Multi-Unit Calibration as a Method for Large Scale IoT Particulate Matter Monitoring Systems Deployments",
pages = "1-1",
doi = "10.1109/TIM.2023.3331428"
}

De Vito, S., D’Elia, G., Ferlito, S., Di Francia, G., Davidović, M., Kleut, D., Stojanović, D.,& Jovašević-Stojanović, M.. (2023). A Global Multi-Unit Calibration as a Method for Large Scale IoT Particulate Matter Monitoring Systems Deployments. in IEEE Transactions on Instrumentation and Measurement, 1-1.
https://doi.org/10.1109/TIM.2023.3331428

De Vito S, D’Elia G, Ferlito S, Di Francia G, Davidović M, Kleut D, Stojanović D, Jovašević-Stojanović M. A Global Multi-Unit Calibration as a Method for Large Scale IoT Particulate Matter Monitoring Systems Deployments. in IEEE Transactions on Instrumentation and Measurement. 2023;:1-1.
doi:10.1109/TIM.2023.3331428 .

De Vito, Saverio, D’Elia, Gerardo, Ferlito, Sergio, Di Francia, Girolamo, Davidović, Miloš, Kleut, Duška, Stojanović, Danka, Jovašević-Stojanović, Milena, "A Global Multi-Unit Calibration as a Method for Large Scale IoT Particulate Matter Monitoring Systems Deployments" in IEEE Transactions on Instrumentation and Measurement (2023):1-1,
https://doi.org/10.1109/TIM.2023.3331428 . .

TY  - JOUR
AU  - Stojanović, Danka
AU  - Kleut, Duška
AU  - Davidović, Miloš
AU  - de Vito, Saverio
AU  - Jovašević-Stojanović, Milena
AU  - Bartonova, Alena
AU  - Lepioufle, Jean-Marie
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12957
AB  - Particulate matter (PM) in air has been proven to be hazardous to human health. Here we focused on analysis of PM data we obtained from the same campaign which was presented in our previous study. Multivariate linear and random forest models were used for the calibration and analysis. In our linear regression model the inputs were PM, temperature and humidity measured with low-cost sensors, and the target was the reference PM measurements obtained from SEPA in the same timeframe.
T2  - Thermal Science
T1  - Low-processing data enrichment and calibration for PM2.5 low-cost sensors
VL  - 27
IS  - 3 Part B
SP  - 2229
EP  - 2240
DO  - 10.2298/TSCI221109221S
ER  - 

@article{
author = "Stojanović, Danka and Kleut, Duška and Davidović, Miloš and de Vito, Saverio and Jovašević-Stojanović, Milena and Bartonova, Alena and Lepioufle, Jean-Marie",
year = "2023",
abstract = "Particulate matter (PM) in air has been proven to be hazardous to human health. Here we focused on analysis of PM data we obtained from the same campaign which was presented in our previous study. Multivariate linear and random forest models were used for the calibration and analysis. In our linear regression model the inputs were PM, temperature and humidity measured with low-cost sensors, and the target was the reference PM measurements obtained from SEPA in the same timeframe.",
journal = "Thermal Science",
title = "Low-processing data enrichment and calibration for PM2.5 low-cost sensors",
volume = "27",
number = "3 Part B",
pages = "2229-2240",
doi = "10.2298/TSCI221109221S"
}

Stojanović, D., Kleut, D., Davidović, M., de Vito, S., Jovašević-Stojanović, M., Bartonova, A.,& Lepioufle, J.. (2023). Low-processing data enrichment and calibration for PM2.5 low-cost sensors. in Thermal Science, 27(3 Part B), 2229-2240.
https://doi.org/10.2298/TSCI221109221S

Stojanović D, Kleut D, Davidović M, de Vito S, Jovašević-Stojanović M, Bartonova A, Lepioufle J. Low-processing data enrichment and calibration for PM2.5 low-cost sensors. in Thermal Science. 2023;27(3 Part B):2229-2240.
doi:10.2298/TSCI221109221S .

Stojanović, Danka, Kleut, Duška, Davidović, Miloš, de Vito, Saverio, Jovašević-Stojanović, Milena, Bartonova, Alena, Lepioufle, Jean-Marie, "Low-processing data enrichment and calibration for PM2.5 low-cost sensors" in Thermal Science, 27, no. 3 Part B (2023):2229-2240,
https://doi.org/10.2298/TSCI221109221S . .

TY  - CONF
AU  - Kleut, Duška
AU  - Milenković, Mila
AU  - Von Kleist-Retzow, Fabian
AU  - Sebbache, Mohamed
AU  - Haddadi, Kamel
AU  - Jovanović, Svetlana
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12212
AB  - With the growing penetration of microwave applications in modern society, exposure to electromagnetic waves (EMWs) may become an important public health problem. In addition, the coexistence of high frequency devices and systems induce electromagnetic Interferences (EMIs) leading to electromagnetic pertubations and lifetime reduction. consequently, shielding materials capable of blocking EMWs are highly needed. In this paper, composite materials based on graphene oxides and silver nanowires were studied as potential EMW shielding materials. Composites were obtained from graphene oxide (GO) with sheet size between 150 and 2000 nm and thicknesses of flakes in range 2–5 nm. Average thickness of free-standing films were around 14.8 μm . We studied the ratio between these nanomaterials to modulate shielding efficiency in a broad microwave frequency range up to 18 GHz. The shielding efficiency of around 6.5 dB was measured for the r-GO free-standing film.
PB  - IEEE : Institute of Electrical and Electronics Engineers
C3  - MARSS 2023 : 6th International Conference on Manipulation, Automation and Robotics at Small Scales : Proceedings
T1  - Microwave Electromagnetic Shielding with Free-Standing Composites Based on Graphene Oxide and Silver Nanowires
SP  - 1
EP  - 6
DO  - 10.1109/MARSS58567.2023.10294133
ER  - 

@conference{
author = "Kleut, Duška and Milenković, Mila and Von Kleist-Retzow, Fabian and Sebbache, Mohamed and Haddadi, Kamel and Jovanović, Svetlana",
year = "2023",
abstract = "With the growing penetration of microwave applications in modern society, exposure to electromagnetic waves (EMWs) may become an important public health problem. In addition, the coexistence of high frequency devices and systems induce electromagnetic Interferences (EMIs) leading to electromagnetic pertubations and lifetime reduction. consequently, shielding materials capable of blocking EMWs are highly needed. In this paper, composite materials based on graphene oxides and silver nanowires were studied as potential EMW shielding materials. Composites were obtained from graphene oxide (GO) with sheet size between 150 and 2000 nm and thicknesses of flakes in range 2–5 nm. Average thickness of free-standing films were around 14.8 μm . We studied the ratio between these nanomaterials to modulate shielding efficiency in a broad microwave frequency range up to 18 GHz. The shielding efficiency of around 6.5 dB was measured for the r-GO free-standing film.",
publisher = "IEEE : Institute of Electrical and Electronics Engineers",
journal = "MARSS 2023 : 6th International Conference on Manipulation, Automation and Robotics at Small Scales : Proceedings",
title = "Microwave Electromagnetic Shielding with Free-Standing Composites Based on Graphene Oxide and Silver Nanowires",
pages = "1-6",
doi = "10.1109/MARSS58567.2023.10294133"
}

Kleut, D., Milenković, M., Von Kleist-Retzow, F., Sebbache, M., Haddadi, K.,& Jovanović, S.. (2023). Microwave Electromagnetic Shielding with Free-Standing Composites Based on Graphene Oxide and Silver Nanowires. in MARSS 2023 : 6th International Conference on Manipulation, Automation and Robotics at Small Scales : Proceedings
IEEE : Institute of Electrical and Electronics Engineers., 1-6.
https://doi.org/10.1109/MARSS58567.2023.10294133

Kleut D, Milenković M, Von Kleist-Retzow F, Sebbache M, Haddadi K, Jovanović S. Microwave Electromagnetic Shielding with Free-Standing Composites Based on Graphene Oxide and Silver Nanowires. in MARSS 2023 : 6th International Conference on Manipulation, Automation and Robotics at Small Scales : Proceedings. 2023;:1-6.
doi:10.1109/MARSS58567.2023.10294133 .

Kleut, Duška, Milenković, Mila, Von Kleist-Retzow, Fabian, Sebbache, Mohamed, Haddadi, Kamel, Jovanović, Svetlana, "Microwave Electromagnetic Shielding with Free-Standing Composites Based on Graphene Oxide and Silver Nanowires" in MARSS 2023 : 6th International Conference on Manipulation, Automation and Robotics at Small Scales : Proceedings (2023):1-6,
https://doi.org/10.1109/MARSS58567.2023.10294133 . .

TY  - JOUR
AU  - Prekodravac, Jovana
AU  - Budimir, Milica
AU  - Kleut, Duška
AU  - Vasiljević, Bojana R.
AU  - Rajić, Vladimir
AU  - Ciasca, Gabriele
AU  - Todorović-Marković, Biljana
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10441
AB  - The carbon quantum dots (CQDs) as zero-dimensional carbon nanomaterials with extraordinary physicochemical properties have a broad range of applications. Some of the most intriguing is the CQD thin films for electronic devices and membrane nanofiltration. Here we present the simple and affordable microwave-assisted synthesis method for the production of the nitrogen-doped CQDs (N-CQD) and iron/nitrogen co-doped CQDs (FeN-CQD). The comprehensive study of the morphology and electrical properties of N-CQD and FeN-CQD was discussed after manufacturing obtained nanomaterials in the form of a thin film on different substrates using different deposition procedures. The morphological features of generated thin films altered dramatically when the substrate and nanomaterial properties, as well as the number of deposited layers of CQDs and the chosen deposition process, were taken into consideration.
T2  - Diamond and Related Materials
T1  - Surface functionality as a key parameter for the conductivity of microwave synthesized CQDs thin films
VL  - 129
SP  - 109366
DO  - 10.1016/j.diamond.2022.109366
ER  - 

@article{
author = "Prekodravac, Jovana and Budimir, Milica and Kleut, Duška and Vasiljević, Bojana R. and Rajić, Vladimir and Ciasca, Gabriele and Todorović-Marković, Biljana",
year = "2022",
abstract = "The carbon quantum dots (CQDs) as zero-dimensional carbon nanomaterials with extraordinary physicochemical properties have a broad range of applications. Some of the most intriguing is the CQD thin films for electronic devices and membrane nanofiltration. Here we present the simple and affordable microwave-assisted synthesis method for the production of the nitrogen-doped CQDs (N-CQD) and iron/nitrogen co-doped CQDs (FeN-CQD). The comprehensive study of the morphology and electrical properties of N-CQD and FeN-CQD was discussed after manufacturing obtained nanomaterials in the form of a thin film on different substrates using different deposition procedures. The morphological features of generated thin films altered dramatically when the substrate and nanomaterial properties, as well as the number of deposited layers of CQDs and the chosen deposition process, were taken into consideration.",
journal = "Diamond and Related Materials",
title = "Surface functionality as a key parameter for the conductivity of microwave synthesized CQDs thin films",
volume = "129",
pages = "109366",
doi = "10.1016/j.diamond.2022.109366"
}

Prekodravac, J., Budimir, M., Kleut, D., Vasiljević, B. R., Rajić, V., Ciasca, G.,& Todorović-Marković, B.. (2022). Surface functionality as a key parameter for the conductivity of microwave synthesized CQDs thin films. in Diamond and Related Materials, 129, 109366.
https://doi.org/10.1016/j.diamond.2022.109366

Prekodravac J, Budimir M, Kleut D, Vasiljević BR, Rajić V, Ciasca G, Todorović-Marković B. Surface functionality as a key parameter for the conductivity of microwave synthesized CQDs thin films. in Diamond and Related Materials. 2022;129:109366.
doi:10.1016/j.diamond.2022.109366 .

Prekodravac, Jovana, Budimir, Milica, Kleut, Duška, Vasiljević, Bojana R., Rajić, Vladimir, Ciasca, Gabriele, Todorović-Marković, Biljana, "Surface functionality as a key parameter for the conductivity of microwave synthesized CQDs thin films" in Diamond and Related Materials, 129 (2022):109366,
https://doi.org/10.1016/j.diamond.2022.109366 . .

TY  - CONF
AU  - Kleut, Duška
AU  - Stojanović, D.
AU  - Davidović, Miloš D.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11001
PB  - Belgrade : University of Belgrade, Vinča Institute of Nuclear Sciences
C3  - WeBIOPATR 2021 : 8th WeBIOPATR Workshop & Conference: Particulate Matter: Research and Management : Abstracts of Keynote Invited Lectures and Contributed Papers; November 29 - December 1, 2021; Belgrade, Serbia
T1  - PM Low-Cost Sensors In-Field Calibration: The Influence of Sampling Coverage and Intervals
SP  - 83
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11001
ER  - 

@conference{
author = "Kleut, Duška and Stojanović, D. and Davidović, Miloš D.",
year = "2021",
publisher = "Belgrade : University of Belgrade, Vinča Institute of Nuclear Sciences",
journal = "WeBIOPATR 2021 : 8th WeBIOPATR Workshop & Conference: Particulate Matter: Research and Management : Abstracts of Keynote Invited Lectures and Contributed Papers; November 29 - December 1, 2021; Belgrade, Serbia",
title = "PM Low-Cost Sensors In-Field Calibration: The Influence of Sampling Coverage and Intervals",
pages = "83",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11001"
}

Kleut, D., Stojanović, D.,& Davidović, M. D.. (2021). PM Low-Cost Sensors In-Field Calibration: The Influence of Sampling Coverage and Intervals. in WeBIOPATR 2021 : 8th WeBIOPATR Workshop & Conference: Particulate Matter: Research and Management : Abstracts of Keynote Invited Lectures and Contributed Papers; November 29 - December 1, 2021; Belgrade, Serbia
Belgrade : University of Belgrade, Vinča Institute of Nuclear Sciences., 83.
https://hdl.handle.net/21.15107/rcub_vinar_11001

Kleut D, Stojanović D, Davidović MD. PM Low-Cost Sensors In-Field Calibration: The Influence of Sampling Coverage and Intervals. in WeBIOPATR 2021 : 8th WeBIOPATR Workshop & Conference: Particulate Matter: Research and Management : Abstracts of Keynote Invited Lectures and Contributed Papers; November 29 - December 1, 2021; Belgrade, Serbia. 2021;:83.
https://hdl.handle.net/21.15107/rcub_vinar_11001 .

Kleut, Duška, Stojanović, D., Davidović, Miloš D., "PM Low-Cost Sensors In-Field Calibration: The Influence of Sampling Coverage and Intervals" in WeBIOPATR 2021 : 8th WeBIOPATR Workshop & Conference: Particulate Matter: Research and Management : Abstracts of Keynote Invited Lectures and Contributed Papers; November 29 - December 1, 2021; Belgrade, Serbia (2021):83,
https://hdl.handle.net/21.15107/rcub_vinar_11001 .

TY  - JOUR
AU  - Kepić, Dejan P.
AU  - Kleut, Duška
AU  - Marković, Zoran M.
AU  - Bajuk-Bogdanović, Danica V.
AU  - Pavlović, Vladimir B.
AU  - Krmpot, Aleksandar
AU  - Lekić, Marina
AU  - Jovanović, Dragana J.
AU  - Todorović-Marković, Biljana
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9568
AB  - Graphene is an excellent material to anchor metal nanoparticles due to its large surface area. In this paper, we report the use of electrochemically exfoliated graphene as support to anchor gold nanoparticles (Au NPs). Au NPs are synthesized via the reduction of chloroauric acid under gamma irradiation at low doses of 1, 5, and 10 kGy and directly deposited onto the graphene surface, making this procedure simple and fast. Good water dispersibility of exfoliated graphene, due to the presence of oxygen-containing functional groups in the structure of graphene, provides long-term stability of Au NPs - graphene composite dispersions. The majority of the Au NPs obtained by this method have sizes of up to 40 nm, while the increase in the applied dose leads to an increase in the amount of smaller nanoparticles. The increase of temperature of the prepared composite material upon irradiation with an 808 nm continuous wave laser was monitored. All samples show a temperature increase between 21.5 and 25.6 °C for 10 min of the laser exposure, which indicates that Au NPs - graphene composite can effectively be used in photothermal treatment for cancer therapy. © 2021 Elsevier Inc.
T2  - Materials Characterization
T1  - One-step preparation of gold nanoparticles - exfoliated graphene composite by gamma irradiation at low doses for photothermal therapy applications
VL  - 173
SP  - 110944
DO  - 10.1016/j.matchar.2021.110944
ER  - 

@article{
author = "Kepić, Dejan P. and Kleut, Duška and Marković, Zoran M. and Bajuk-Bogdanović, Danica V. and Pavlović, Vladimir B. and Krmpot, Aleksandar and Lekić, Marina and Jovanović, Dragana J. and Todorović-Marković, Biljana",
year = "2021",
abstract = "Graphene is an excellent material to anchor metal nanoparticles due to its large surface area. In this paper, we report the use of electrochemically exfoliated graphene as support to anchor gold nanoparticles (Au NPs). Au NPs are synthesized via the reduction of chloroauric acid under gamma irradiation at low doses of 1, 5, and 10 kGy and directly deposited onto the graphene surface, making this procedure simple and fast. Good water dispersibility of exfoliated graphene, due to the presence of oxygen-containing functional groups in the structure of graphene, provides long-term stability of Au NPs - graphene composite dispersions. The majority of the Au NPs obtained by this method have sizes of up to 40 nm, while the increase in the applied dose leads to an increase in the amount of smaller nanoparticles. The increase of temperature of the prepared composite material upon irradiation with an 808 nm continuous wave laser was monitored. All samples show a temperature increase between 21.5 and 25.6 °C for 10 min of the laser exposure, which indicates that Au NPs - graphene composite can effectively be used in photothermal treatment for cancer therapy. © 2021 Elsevier Inc.",
journal = "Materials Characterization",
title = "One-step preparation of gold nanoparticles - exfoliated graphene composite by gamma irradiation at low doses for photothermal therapy applications",
volume = "173",
pages = "110944",
doi = "10.1016/j.matchar.2021.110944"
}

Kepić, D. P., Kleut, D., Marković, Z. M., Bajuk-Bogdanović, D. V., Pavlović, V. B., Krmpot, A., Lekić, M., Jovanović, D. J.,& Todorović-Marković, B.. (2021). One-step preparation of gold nanoparticles - exfoliated graphene composite by gamma irradiation at low doses for photothermal therapy applications. in Materials Characterization, 173, 110944.
https://doi.org/10.1016/j.matchar.2021.110944

Kepić DP, Kleut D, Marković ZM, Bajuk-Bogdanović DV, Pavlović VB, Krmpot A, Lekić M, Jovanović DJ, Todorović-Marković B. One-step preparation of gold nanoparticles - exfoliated graphene composite by gamma irradiation at low doses for photothermal therapy applications. in Materials Characterization. 2021;173:110944.
doi:10.1016/j.matchar.2021.110944 .

Kepić, Dejan P., Kleut, Duška, Marković, Zoran M., Bajuk-Bogdanović, Danica V., Pavlović, Vladimir B., Krmpot, Aleksandar, Lekić, Marina, Jovanović, Dragana J., Todorović-Marković, Biljana, "One-step preparation of gold nanoparticles - exfoliated graphene composite by gamma irradiation at low doses for photothermal therapy applications" in Materials Characterization, 173 (2021):110944,
https://doi.org/10.1016/j.matchar.2021.110944 . .

TY  - JOUR
AU  - Krunić, Matija
AU  - Ristić, Biljana
AU  - Bošnjak, Mihajlo
AU  - Paunović, Verica
AU  - Tovilović-Kovačević, Gordana
AU  - Zogović, Nevena
AU  - Mirčić, Aleksandar
AU  - Marković, Zoran
AU  - Todorović-Marković, Biljana
AU  - Jovanović, Svetlana P.
AU  - Kleut, Duška
AU  - Mojović, Miloš
AU  - Nakarada, Đura
AU  - Marković, Olivera
AU  - Vuković, Irena
AU  - Harhaji-Trajković, Ljubica
AU  - Trajković, Vladimir S.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9980
AB  - We investigated the ability of graphene quantum dot (GQD) nanoparticles to protect SH-SY5Y human neuroblastoma cells from oxidative/nitrosative stress induced by iron-nitrosyl complex sodium nitroprusside (SNP).GQD reduced SNP cytotoxicity by preventing mitochondrial depolarization, caspase-2 activation, and subsequent apoptotic death. Although GQD diminished the levels of nitric oxide (NO) in SNP-exposed cells, NO scavengers displayed only a slight protective effect, suggesting that NO quenching was not the main protective mechanism of GQD. GQD also reduced SNP-triggered increase in the intracellular levels of hydroxyl radical (•OH), superoxide anion (O2•- ), and lipid peroxidation. Nonselective antioxidants, •OH scavenging, and iron chelators, but not superoxide dismutase, mimicked GQD cytoprotective activity, indicating that GQD protect cells by neutralizing •OH generated in the presence of SNP-released iron. Cellular internalization of GQD was required for optimal protection, since a removal of extracellular GQD by extensive washing only partly diminished their protective effect. Moreover, GQD cooperated with SNP to induce autophagy, as confirmed by the inhibition of autophagylimiting Akt/PRAS40/mTOR signaling and increase in autophagy gene transcription, protein levels of proautophagic beclin-1 and LC3-II, formation of autophagic vesicles, and degradation of autophagic target p62. The antioxidant activity of GQD was not involved in autophagy induction, as antioxidants N-acetylcysteine and dimethyl sulfoxide failed to stimulate autophagy in SNP-exposed cells. Pharmacological inhibitors of early (wortmannin, 3-methyladenine) or late stages of autophagy (NH4Cl) efficiently reduced the protective effect of GQD. Therefore, the ability of GQD to prevent the in vitro neurotoxicity of SNP depends on both •OH/NO scavenging and induction of cytoprotective autophagy.
T2  - Free Radical Biology and Medicine
T1  - Graphene quantum dot antioxidant and proautophagic actions protect SH-SY5Y neuroblastoma cells from oxidative stress-mediated apoptotic death
VL  - 177
SP  - 167
EP  - 180
DO  - 10.1016/j.freeradbiomed.2021.10.025
ER  - 

@article{
author = "Krunić, Matija and Ristić, Biljana and Bošnjak, Mihajlo and Paunović, Verica and Tovilović-Kovačević, Gordana and Zogović, Nevena and Mirčić, Aleksandar and Marković, Zoran and Todorović-Marković, Biljana and Jovanović, Svetlana P. and Kleut, Duška and Mojović, Miloš and Nakarada, Đura and Marković, Olivera and Vuković, Irena and Harhaji-Trajković, Ljubica and Trajković, Vladimir S.",
year = "2021",
abstract = "We investigated the ability of graphene quantum dot (GQD) nanoparticles to protect SH-SY5Y human neuroblastoma cells from oxidative/nitrosative stress induced by iron-nitrosyl complex sodium nitroprusside (SNP).GQD reduced SNP cytotoxicity by preventing mitochondrial depolarization, caspase-2 activation, and subsequent apoptotic death. Although GQD diminished the levels of nitric oxide (NO) in SNP-exposed cells, NO scavengers displayed only a slight protective effect, suggesting that NO quenching was not the main protective mechanism of GQD. GQD also reduced SNP-triggered increase in the intracellular levels of hydroxyl radical (•OH), superoxide anion (O2•- ), and lipid peroxidation. Nonselective antioxidants, •OH scavenging, and iron chelators, but not superoxide dismutase, mimicked GQD cytoprotective activity, indicating that GQD protect cells by neutralizing •OH generated in the presence of SNP-released iron. Cellular internalization of GQD was required for optimal protection, since a removal of extracellular GQD by extensive washing only partly diminished their protective effect. Moreover, GQD cooperated with SNP to induce autophagy, as confirmed by the inhibition of autophagylimiting Akt/PRAS40/mTOR signaling and increase in autophagy gene transcription, protein levels of proautophagic beclin-1 and LC3-II, formation of autophagic vesicles, and degradation of autophagic target p62. The antioxidant activity of GQD was not involved in autophagy induction, as antioxidants N-acetylcysteine and dimethyl sulfoxide failed to stimulate autophagy in SNP-exposed cells. Pharmacological inhibitors of early (wortmannin, 3-methyladenine) or late stages of autophagy (NH4Cl) efficiently reduced the protective effect of GQD. Therefore, the ability of GQD to prevent the in vitro neurotoxicity of SNP depends on both •OH/NO scavenging and induction of cytoprotective autophagy.",
journal = "Free Radical Biology and Medicine",
title = "Graphene quantum dot antioxidant and proautophagic actions protect SH-SY5Y neuroblastoma cells from oxidative stress-mediated apoptotic death",
volume = "177",
pages = "167-180",
doi = "10.1016/j.freeradbiomed.2021.10.025"
}

Krunić, M., Ristić, B., Bošnjak, M., Paunović, V., Tovilović-Kovačević, G., Zogović, N., Mirčić, A., Marković, Z., Todorović-Marković, B., Jovanović, S. P., Kleut, D., Mojović, M., Nakarada, Đ., Marković, O., Vuković, I., Harhaji-Trajković, L.,& Trajković, V. S.. (2021). Graphene quantum dot antioxidant and proautophagic actions protect SH-SY5Y neuroblastoma cells from oxidative stress-mediated apoptotic death. in Free Radical Biology and Medicine, 177, 167-180.
https://doi.org/10.1016/j.freeradbiomed.2021.10.025

Krunić M, Ristić B, Bošnjak M, Paunović V, Tovilović-Kovačević G, Zogović N, Mirčić A, Marković Z, Todorović-Marković B, Jovanović SP, Kleut D, Mojović M, Nakarada Đ, Marković O, Vuković I, Harhaji-Trajković L, Trajković VS. Graphene quantum dot antioxidant and proautophagic actions protect SH-SY5Y neuroblastoma cells from oxidative stress-mediated apoptotic death. in Free Radical Biology and Medicine. 2021;177:167-180.
doi:10.1016/j.freeradbiomed.2021.10.025 .

Krunić, Matija, Ristić, Biljana, Bošnjak, Mihajlo, Paunović, Verica, Tovilović-Kovačević, Gordana, Zogović, Nevena, Mirčić, Aleksandar, Marković, Zoran, Todorović-Marković, Biljana, Jovanović, Svetlana P., Kleut, Duška, Mojović, Miloš, Nakarada, Đura, Marković, Olivera, Vuković, Irena, Harhaji-Trajković, Ljubica, Trajković, Vladimir S., "Graphene quantum dot antioxidant and proautophagic actions protect SH-SY5Y neuroblastoma cells from oxidative stress-mediated apoptotic death" in Free Radical Biology and Medicine, 177 (2021):167-180,
https://doi.org/10.1016/j.freeradbiomed.2021.10.025 . .

TY  - CONF
AU  - Milenković, Mila
AU  - Kleut, Duška
AU  - Jovanović, Svetlana P.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10907
AB  - Zero-dimensional graphene quantum dots (GQDs) are one of the most promising luminescent carbonderived nanomaterials with different oxygen-containing functional groups on their surface. They consist of one or few layers of graphene and have a lateral dimension below 100 nm. Some of their distinct and superior physical and chemical properties such as tunable photoluminescence, good biocompatibility, low toxicity, and excellent dispersibility in water, make them a promising candidate for biomedical applications [1]. With the functionalization of GQDs, it is possible to modify their surface structure by adding other functional groups thus altering photoluminescence and enhancing their other properties [2]. Gamma irradiation proved to be a simple and eco-friendly method for subsequent modification of carbon nanomaterials [3, 4]. Here, we present a simple, one-step method for functionalization of GQDs with gamma irradiation in the presence of amino acid L-cysteine as an S, N heteroatom donor and isopropyl alcohol as a radical scavenger. Water dispersion of GQDs with 1 vol% isopropyl alcohol and 2 mass% of L-cysteine was purged with Ar gas for 15 minutes and then exposed to gamma irradiation at doses: 25, 50 and 200 kGy. The optical and structural properties of obtained S, N-GQDs were investigated using Ultraviolet-visible spectroscopy (UV-Vis), Fourier-Transform Infrared spectroscopy (FTIR), Photoluminescence spectroscopy (PL), Atomic force microscopy (AFM) and Dynamic light scattering (DLS). Successful doping of S and N heteroatoms in the structure of irradiated GQDs was confirmed with FTIR analysis through detected S-H, C=S, and N-H stretching vibrations. Also, an improvement in photoluminescence quantum yield (QY) has been proved by PL measurements. The best result was achieved for the sample irradiated with a dose of 25 kGy. PL QY of this sample was 15 times higher compared to non-irradiated p-GQDs, and around 7 times higher up against other irradiated samples. Both AFM and DLS measurements were in correlation and indicated that gamma irradiation increased the layer separation and overall particle diameter of GQDs. The average diameter ranged from 25 nm up to around 30 nm for irradiated samples while the diameter of non-irradiated p-GQDs was 20 nm. The proposed one-step chemical doping provided an improvement in one of the most characteristic features of GQDs- photoluminescence, as well as in morphological properties. Due to this, the obtained S, N-GQDs have great potential for application in medicine as a bioimaging agent
PB  - Belgrade : Institute of Physics Belgrade
C3  - PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
T1  - Enhanced photoluminescence of gamma-irradiated S, N graphene quantum dots
SP  - 87
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10907
ER  - 

@conference{
author = "Milenković, Mila and Kleut, Duška and Jovanović, Svetlana P.",
year = "2021",
abstract = "Zero-dimensional graphene quantum dots (GQDs) are one of the most promising luminescent carbonderived nanomaterials with different oxygen-containing functional groups on their surface. They consist of one or few layers of graphene and have a lateral dimension below 100 nm. Some of their distinct and superior physical and chemical properties such as tunable photoluminescence, good biocompatibility, low toxicity, and excellent dispersibility in water, make them a promising candidate for biomedical applications [1]. With the functionalization of GQDs, it is possible to modify their surface structure by adding other functional groups thus altering photoluminescence and enhancing their other properties [2]. Gamma irradiation proved to be a simple and eco-friendly method for subsequent modification of carbon nanomaterials [3, 4]. Here, we present a simple, one-step method for functionalization of GQDs with gamma irradiation in the presence of amino acid L-cysteine as an S, N heteroatom donor and isopropyl alcohol as a radical scavenger. Water dispersion of GQDs with 1 vol% isopropyl alcohol and 2 mass% of L-cysteine was purged with Ar gas for 15 minutes and then exposed to gamma irradiation at doses: 25, 50 and 200 kGy. The optical and structural properties of obtained S, N-GQDs were investigated using Ultraviolet-visible spectroscopy (UV-Vis), Fourier-Transform Infrared spectroscopy (FTIR), Photoluminescence spectroscopy (PL), Atomic force microscopy (AFM) and Dynamic light scattering (DLS). Successful doping of S and N heteroatoms in the structure of irradiated GQDs was confirmed with FTIR analysis through detected S-H, C=S, and N-H stretching vibrations. Also, an improvement in photoluminescence quantum yield (QY) has been proved by PL measurements. The best result was achieved for the sample irradiated with a dose of 25 kGy. PL QY of this sample was 15 times higher compared to non-irradiated p-GQDs, and around 7 times higher up against other irradiated samples. Both AFM and DLS measurements were in correlation and indicated that gamma irradiation increased the layer separation and overall particle diameter of GQDs. The average diameter ranged from 25 nm up to around 30 nm for irradiated samples while the diameter of non-irradiated p-GQDs was 20 nm. The proposed one-step chemical doping provided an improvement in one of the most characteristic features of GQDs- photoluminescence, as well as in morphological properties. Due to this, the obtained S, N-GQDs have great potential for application in medicine as a bioimaging agent",
publisher = "Belgrade : Institute of Physics Belgrade",
journal = "PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade",
title = "Enhanced photoluminescence of gamma-irradiated S, N graphene quantum dots",
pages = "87",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10907"
}

Milenković, M., Kleut, D.,& Jovanović, S. P.. (2021). Enhanced photoluminescence of gamma-irradiated S, N graphene quantum dots. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
Belgrade : Institute of Physics Belgrade., 87.
https://hdl.handle.net/21.15107/rcub_vinar_10907

Milenković M, Kleut D, Jovanović SP. Enhanced photoluminescence of gamma-irradiated S, N graphene quantum dots. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade. 2021;:87.
https://hdl.handle.net/21.15107/rcub_vinar_10907 .

Milenković, Mila, Kleut, Duška, Jovanović, Svetlana P., "Enhanced photoluminescence of gamma-irradiated S, N graphene quantum dots" in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade (2021):87,
https://hdl.handle.net/21.15107/rcub_vinar_10907 .

TY  - CONF
AU  - Dorontić, Slađana
AU  - Marković, Olivera
AU  - Kleut, Duška
AU  - Jovanović, Svetlana
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11419
AB  - Graphene quantum dots (GQDs) were fabricated by simple electrochemical oxidation of graphite electrodes. Modified GQDs were obtained by gamma irradiation of GQDs, EDA, and IPA mixture at a dose of 25 kGy. In this approach, GQDs with the amino groups were produced (25γ-GQDs). These GQDs have shown a high uniformity, good dispersibility in water, and strong photoluminescence in the blue part of the electromagnetic spectrum. Modified GQDs were studied in the optical detection of Co2+ ions. The PL intensities of GQDs were measured in the presence of Co2+ ions in the concentration range 0-7.5 μmol L-1. It was demonstrated that PL intensities decreased linearly in the concentration range 0-2.5 μmol L-1. The value of the coefficient of determination (R2= 0.95949) indicates the potential of 25γ-GQDs for application in optical sensing of Co2+ ions.
PB  - Szeged : University of Szeged
C3  - 27th International Symposium on Analytical and Environmental Problems : Proceedings; November 22-23, 2021; Szeged, Hungary
T1  - Amino Functionalized Graphene Quantum Dots - New Fluorescent Sensor for Co2+ Ions
SP  - 107
EP  - 111
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11419
ER  - 

@conference{
author = "Dorontić, Slađana and Marković, Olivera and Kleut, Duška and Jovanović, Svetlana",
year = "2021",
abstract = "Graphene quantum dots (GQDs) were fabricated by simple electrochemical oxidation of graphite electrodes. Modified GQDs were obtained by gamma irradiation of GQDs, EDA, and IPA mixture at a dose of 25 kGy. In this approach, GQDs with the amino groups were produced (25γ-GQDs). These GQDs have shown a high uniformity, good dispersibility in water, and strong photoluminescence in the blue part of the electromagnetic spectrum. Modified GQDs were studied in the optical detection of Co2+ ions. The PL intensities of GQDs were measured in the presence of Co2+ ions in the concentration range 0-7.5 μmol L-1. It was demonstrated that PL intensities decreased linearly in the concentration range 0-2.5 μmol L-1. The value of the coefficient of determination (R2= 0.95949) indicates the potential of 25γ-GQDs for application in optical sensing of Co2+ ions.",
publisher = "Szeged : University of Szeged",
journal = "27th International Symposium on Analytical and Environmental Problems : Proceedings; November 22-23, 2021; Szeged, Hungary",
title = "Amino Functionalized Graphene Quantum Dots - New Fluorescent Sensor for Co2+ Ions",
pages = "107-111",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11419"
}

Dorontić, S., Marković, O., Kleut, D.,& Jovanović, S.. (2021). Amino Functionalized Graphene Quantum Dots - New Fluorescent Sensor for Co2+ Ions. in 27th International Symposium on Analytical and Environmental Problems : Proceedings; November 22-23, 2021; Szeged, Hungary
Szeged : University of Szeged., 107-111.
https://hdl.handle.net/21.15107/rcub_vinar_11419

Dorontić S, Marković O, Kleut D, Jovanović S. Amino Functionalized Graphene Quantum Dots - New Fluorescent Sensor for Co2+ Ions. in 27th International Symposium on Analytical and Environmental Problems : Proceedings; November 22-23, 2021; Szeged, Hungary. 2021;:107-111.
https://hdl.handle.net/21.15107/rcub_vinar_11419 .

Dorontić, Slađana, Marković, Olivera, Kleut, Duška, Jovanović, Svetlana, "Amino Functionalized Graphene Quantum Dots - New Fluorescent Sensor for Co2+ Ions" in 27th International Symposium on Analytical and Environmental Problems : Proceedings; November 22-23, 2021; Szeged, Hungary (2021):107-111,
https://hdl.handle.net/21.15107/rcub_vinar_11419 .

TY  - CONF
AU  - Kepić, Dejan
AU  - Huskić, Miroslav
AU  - Prekodravac, Jovana
AU  - Kleut, Duška
AU  - Todorović-Marković, Biljana
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11421
AB  - This article investigates the morphology of polyaniline/electrochemically exfoliated graphene composites prepared by oxidative polymerization with ammonium persulfate at a constant temperature (15 °C). During the polymerization, the pH of the reaction mixture decreases, which was used to monitor the rate of the reaction. A granular morphology with the presence of large sheet-like structures is found to be predominant for the composite prepared without added acid, while rod-shaped and tubular morphology is characteristic for the composite prepared with the addition of glacial acetic acid. The nanotubular and nanorod morphology of the sample prepared with the addition of glacial acetic acid was also confirmed by the presence of prominent phenazine structural units in Raman spectra. The composite prepared with the addition of HCl has granular morphology with a small amount of rod-like structures.
PB  - Szeged : University of Szeged
C3  - 27th International Symposium on Analytical and Environmental Problems : Proceedings; November 22-23, 2021; Szeged, Hungary
T1  - The Morphology of Pani/Graphene Composites Prepared Under Isothermal Conditions
SP  - 159
EP  - 163
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11421
ER  - 

@conference{
author = "Kepić, Dejan and Huskić, Miroslav and Prekodravac, Jovana and Kleut, Duška and Todorović-Marković, Biljana",
year = "2021",
abstract = "This article investigates the morphology of polyaniline/electrochemically exfoliated graphene composites prepared by oxidative polymerization with ammonium persulfate at a constant temperature (15 °C). During the polymerization, the pH of the reaction mixture decreases, which was used to monitor the rate of the reaction. A granular morphology with the presence of large sheet-like structures is found to be predominant for the composite prepared without added acid, while rod-shaped and tubular morphology is characteristic for the composite prepared with the addition of glacial acetic acid. The nanotubular and nanorod morphology of the sample prepared with the addition of glacial acetic acid was also confirmed by the presence of prominent phenazine structural units in Raman spectra. The composite prepared with the addition of HCl has granular morphology with a small amount of rod-like structures.",
publisher = "Szeged : University of Szeged",
journal = "27th International Symposium on Analytical and Environmental Problems : Proceedings; November 22-23, 2021; Szeged, Hungary",
title = "The Morphology of Pani/Graphene Composites Prepared Under Isothermal Conditions",
pages = "159-163",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11421"
}

Kepić, D., Huskić, M., Prekodravac, J., Kleut, D.,& Todorović-Marković, B.. (2021). The Morphology of Pani/Graphene Composites Prepared Under Isothermal Conditions. in 27th International Symposium on Analytical and Environmental Problems : Proceedings; November 22-23, 2021; Szeged, Hungary
Szeged : University of Szeged., 159-163.
https://hdl.handle.net/21.15107/rcub_vinar_11421

Kepić D, Huskić M, Prekodravac J, Kleut D, Todorović-Marković B. The Morphology of Pani/Graphene Composites Prepared Under Isothermal Conditions. in 27th International Symposium on Analytical and Environmental Problems : Proceedings; November 22-23, 2021; Szeged, Hungary. 2021;:159-163.
https://hdl.handle.net/21.15107/rcub_vinar_11421 .

Kepić, Dejan, Huskić, Miroslav, Prekodravac, Jovana, Kleut, Duška, Todorović-Marković, Biljana, "The Morphology of Pani/Graphene Composites Prepared Under Isothermal Conditions" in 27th International Symposium on Analytical and Environmental Problems : Proceedings; November 22-23, 2021; Szeged, Hungary (2021):159-163,
https://hdl.handle.net/21.15107/rcub_vinar_11421 .

TY  - CONF
AU  - Prekodravac, Jovana
AU  - Vasiljević, Bojana
AU  - Marinković, Dragana
AU  - Kepić, Dejan
AU  - Kleut, Duška
AU  - Todorović Marković, Biljana
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11427
AB  - The modern age science is still searching for an effective photocatalytic material for the treatment of colored discharges from different industries which cause severe environmental issues. The excellent properties of nitrogen doped carbon quantum dots (N-CQD) enable their successful application as photocatalytic material in organic dye removal triggered under light absorption. With this in mind we first present a successfully performed microwave-assisted synthesis method, a green, simple and economically affordable method for N-CQD synthesis with high nitrogen percentage incorporated in the form of pyrrolic, pyridinic/NH2 and graphitic/NH3+ groups. The pro-oxidant and antioxidant features of the synthesized N-CQD were further presented, with high removal efficiency of synthesized N-CQD towards the methylene blue (MB) organic dye, as one of the leading water pollutants with a major risk to aquatic and human life.
PB  - Szeged : University of Szeged
C3  - 27th International Symposium on Analytical and Environmental Problems : Proceedings; November 22-23, 2021; Szeged, Hungary
T1  - Antioxidant and Prooxidant Features of N-CQD in Photocatalytic Testing of Aquatic Media
SP  - 286
EP  - 290
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11427
ER  - 

@conference{
author = "Prekodravac, Jovana and Vasiljević, Bojana and Marinković, Dragana and Kepić, Dejan and Kleut, Duška and Todorović Marković, Biljana",
year = "2021",
abstract = "The modern age science is still searching for an effective photocatalytic material for the treatment of colored discharges from different industries which cause severe environmental issues. The excellent properties of nitrogen doped carbon quantum dots (N-CQD) enable their successful application as photocatalytic material in organic dye removal triggered under light absorption. With this in mind we first present a successfully performed microwave-assisted synthesis method, a green, simple and economically affordable method for N-CQD synthesis with high nitrogen percentage incorporated in the form of pyrrolic, pyridinic/NH2 and graphitic/NH3+ groups. The pro-oxidant and antioxidant features of the synthesized N-CQD were further presented, with high removal efficiency of synthesized N-CQD towards the methylene blue (MB) organic dye, as one of the leading water pollutants with a major risk to aquatic and human life.",
publisher = "Szeged : University of Szeged",
journal = "27th International Symposium on Analytical and Environmental Problems : Proceedings; November 22-23, 2021; Szeged, Hungary",
title = "Antioxidant and Prooxidant Features of N-CQD in Photocatalytic Testing of Aquatic Media",
pages = "286-290",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11427"
}

Prekodravac, J., Vasiljević, B., Marinković, D., Kepić, D., Kleut, D.,& Todorović Marković, B.. (2021). Antioxidant and Prooxidant Features of N-CQD in Photocatalytic Testing of Aquatic Media. in 27th International Symposium on Analytical and Environmental Problems : Proceedings; November 22-23, 2021; Szeged, Hungary
Szeged : University of Szeged., 286-290.
https://hdl.handle.net/21.15107/rcub_vinar_11427

Prekodravac J, Vasiljević B, Marinković D, Kepić D, Kleut D, Todorović Marković B. Antioxidant and Prooxidant Features of N-CQD in Photocatalytic Testing of Aquatic Media. in 27th International Symposium on Analytical and Environmental Problems : Proceedings; November 22-23, 2021; Szeged, Hungary. 2021;:286-290.
https://hdl.handle.net/21.15107/rcub_vinar_11427 .

Prekodravac, Jovana, Vasiljević, Bojana, Marinković, Dragana, Kepić, Dejan, Kleut, Duška, Todorović Marković, Biljana, "Antioxidant and Prooxidant Features of N-CQD in Photocatalytic Testing of Aquatic Media" in 27th International Symposium on Analytical and Environmental Problems : Proceedings; November 22-23, 2021; Szeged, Hungary (2021):286-290,
https://hdl.handle.net/21.15107/rcub_vinar_11427 .

TY  - CONF
AU  - Dorontić, Slađana
AU  - Marković, Olivera S.
AU  - Kleut, Duška
AU  - Jovanović, Svetlana P.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12499
AB  - We produced Graphene Quantum Dots (GQDs) by electrochemical oxidation of graphite rods and exposed them to gamma irradiation at a dose of 200 kGy, in the presence of ethylene-diamine. Before irradiation, oxygen was removed from the GQDs dispersion by purging with Ar. These conditions induced both chemical reduction as well as the incorporation of N atoms in the structure of GQDs. Thus, N-doped GQDs were produced. The morphology of dots was investigated using atomic force microscopy. UV-Vis and photoluminescence spectroscopy were used to investigate the optical properties of modified GQDs. The changes in the intensities of PL emission spectra were studied in the presence of different concentrations of Pd2+ and pesticide carbofuran. We observed promising results for the application of N-doped GQDs for non-enzymatic PL detection of selected metal ions and molecules of pesticide.
PB  - Szeged : University of Szeged
C3  - 27th International Symposium on Analytical and Environmental Problems, Szeged, Hungary November 22-23, 2021
T1  - N-doped graphene quantum dots for detection of palladium(II) ions and carbofuran
SP  - 143
EP  - 147
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12499
ER  - 

@conference{
author = "Dorontić, Slađana and Marković, Olivera S. and Kleut, Duška and Jovanović, Svetlana P.",
year = "2021",
abstract = "We produced Graphene Quantum Dots (GQDs) by electrochemical oxidation of graphite rods and exposed them to gamma irradiation at a dose of 200 kGy, in the presence of ethylene-diamine. Before irradiation, oxygen was removed from the GQDs dispersion by purging with Ar. These conditions induced both chemical reduction as well as the incorporation of N atoms in the structure of GQDs. Thus, N-doped GQDs were produced. The morphology of dots was investigated using atomic force microscopy. UV-Vis and photoluminescence spectroscopy were used to investigate the optical properties of modified GQDs. The changes in the intensities of PL emission spectra were studied in the presence of different concentrations of Pd2+ and pesticide carbofuran. We observed promising results for the application of N-doped GQDs for non-enzymatic PL detection of selected metal ions and molecules of pesticide.",
publisher = "Szeged : University of Szeged",
journal = "27th International Symposium on Analytical and Environmental Problems, Szeged, Hungary November 22-23, 2021",
title = "N-doped graphene quantum dots for detection of palladium(II) ions and carbofuran",
pages = "143-147",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12499"
}

Dorontić, S., Marković, O. S., Kleut, D.,& Jovanović, S. P.. (2021). N-doped graphene quantum dots for detection of palladium(II) ions and carbofuran. in 27th International Symposium on Analytical and Environmental Problems, Szeged, Hungary November 22-23, 2021
Szeged : University of Szeged., 143-147.
https://hdl.handle.net/21.15107/rcub_vinar_12499

Dorontić S, Marković OS, Kleut D, Jovanović SP. N-doped graphene quantum dots for detection of palladium(II) ions and carbofuran. in 27th International Symposium on Analytical and Environmental Problems, Szeged, Hungary November 22-23, 2021. 2021;:143-147.
https://hdl.handle.net/21.15107/rcub_vinar_12499 .

Dorontić, Slađana, Marković, Olivera S., Kleut, Duška, Jovanović, Svetlana P., "N-doped graphene quantum dots for detection of palladium(II) ions and carbofuran" in 27th International Symposium on Analytical and Environmental Problems, Szeged, Hungary November 22-23, 2021 (2021):143-147,
https://hdl.handle.net/21.15107/rcub_vinar_12499 .

TY  - CONF
AU  - Dorontić, Slađana
AU  - Marković, Olivera S.
AU  - Kleut, Duška
AU  - Jovanović, Svetlana P.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12501
AB  - In the era of pollution and hazardous materials, new methods for the detection of pollutantsin the environment are urgently needed. Due to their specific features such asphotoluminescence (PL) in the visible part of the spectrum, dispersibility in water, andorganic solvents, nontoxicity, and biocompatibility, graphene quantum dots (GQDs) attractattention in optical sensing of various ions and molecules. In this study, pristine graphenequantum dots (p-GQDs) were produced in a simple single-step electrochemical top-downapproach using graphite electrodes as a starting material, and dispersion of sodiumhydroxidein 96% ethanol as a medium for electrochemical reaction. These p-GQDs weregamma-irradiated in a dose of 25 kGy in presence of ethylenediamine in Ar medium tointroduce amino groups in their crystal lattice. Results obtained from AFM microscopyindicate the height-uniformity of irradiated GQDs. The presence of amino groups in GQDswas confirmed by FTIR, XPS, and UV-Vis spectroscopies. According to results obtainedfrom PL spectroscopy, a significant narrowing of emission band in irradiated GQDs wasobserved. In further research, these GQDs were investigated as a potential PL sensor for ironwhich is one of the most abundant heavy metal in the environment. In the preliminaryinvestigation, a water dispersion of irradiated GQDs was mixed with Fe(III) solution inconcentrations of 50 and 100 μM. Using a PL spectroscopy the PL intensity of irradiatedGQDs in presence of Fe (III) was measured. From the obtained results, it can be seen thatFe(III) ions lead to quenching of GQDs PL intensity. Then, PL intensities were measured inpresence of Fe(III) ions in concentration range 0-100 μM. With an increase of Fe(III)concentration, the PL intensity of GQDs decreased. It can be concluded that gammairradiatedamino-doped GQDs have significant potential in the so-called ,,turn of“ detectionof Fe(III) ions in the aqueous medium.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - 19th Young Researchers’ Conference - Materials Science and Engineering : Program and the Book of Abstracts
T1  - Graphene quantum dots with amino groups as a potential photoluminescent probe for Fe(III) ions
SP  - 35
EP  - 35
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12501
ER  - 

@conference{
author = "Dorontić, Slađana and Marković, Olivera S. and Kleut, Duška and Jovanović, Svetlana P.",
year = "2021",
abstract = "In the era of pollution and hazardous materials, new methods for the detection of pollutantsin the environment are urgently needed. Due to their specific features such asphotoluminescence (PL) in the visible part of the spectrum, dispersibility in water, andorganic solvents, nontoxicity, and biocompatibility, graphene quantum dots (GQDs) attractattention in optical sensing of various ions and molecules. In this study, pristine graphenequantum dots (p-GQDs) were produced in a simple single-step electrochemical top-downapproach using graphite electrodes as a starting material, and dispersion of sodiumhydroxidein 96% ethanol as a medium for electrochemical reaction. These p-GQDs weregamma-irradiated in a dose of 25 kGy in presence of ethylenediamine in Ar medium tointroduce amino groups in their crystal lattice. Results obtained from AFM microscopyindicate the height-uniformity of irradiated GQDs. The presence of amino groups in GQDswas confirmed by FTIR, XPS, and UV-Vis spectroscopies. According to results obtainedfrom PL spectroscopy, a significant narrowing of emission band in irradiated GQDs wasobserved. In further research, these GQDs were investigated as a potential PL sensor for ironwhich is one of the most abundant heavy metal in the environment. In the preliminaryinvestigation, a water dispersion of irradiated GQDs was mixed with Fe(III) solution inconcentrations of 50 and 100 μM. Using a PL spectroscopy the PL intensity of irradiatedGQDs in presence of Fe (III) was measured. From the obtained results, it can be seen thatFe(III) ions lead to quenching of GQDs PL intensity. Then, PL intensities were measured inpresence of Fe(III) ions in concentration range 0-100 μM. With an increase of Fe(III)concentration, the PL intensity of GQDs decreased. It can be concluded that gammairradiatedamino-doped GQDs have significant potential in the so-called ,,turn of“ detectionof Fe(III) ions in the aqueous medium.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "19th Young Researchers’ Conference - Materials Science and Engineering : Program and the Book of Abstracts",
title = "Graphene quantum dots with amino groups as a potential photoluminescent probe for Fe(III) ions",
pages = "35-35",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12501"
}

Dorontić, S., Marković, O. S., Kleut, D.,& Jovanović, S. P.. (2021). Graphene quantum dots with amino groups as a potential photoluminescent probe for Fe(III) ions. in 19th Young Researchers’ Conference - Materials Science and Engineering : Program and the Book of Abstracts
Belgrade : Institute of Technical Sciences of SASA., 35-35.
https://hdl.handle.net/21.15107/rcub_vinar_12501

Dorontić S, Marković OS, Kleut D, Jovanović SP. Graphene quantum dots with amino groups as a potential photoluminescent probe for Fe(III) ions. in 19th Young Researchers’ Conference - Materials Science and Engineering : Program and the Book of Abstracts. 2021;:35-35.
https://hdl.handle.net/21.15107/rcub_vinar_12501 .

Dorontić, Slađana, Marković, Olivera S., Kleut, Duška, Jovanović, Svetlana P., "Graphene quantum dots with amino groups as a potential photoluminescent probe for Fe(III) ions" in 19th Young Researchers’ Conference - Materials Science and Engineering : Program and the Book of Abstracts (2021):35-35,
https://hdl.handle.net/21.15107/rcub_vinar_12501 .

TY  - JOUR
AU  - Prekodravac, Jovana
AU  - Vasiljević, Bojana
AU  - Marković, Zoran M.
AU  - Jovanović, Dragana J.
AU  - Kleut, Duška
AU  - Špitalsky, Zdenko
AU  - Mičušik, Matej
AU  - Danko, Martin
AU  - Bajuk-Bogdanović, Danica V.
AU  - Todorović-Marković, Biljana
PY  - 2019
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0272884219313598
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8211
AB  - Industrialization today leads to a significant increase in the environmental pollution, with number of phenols, pesticides, paints, solvents and other organic pollutants with potentially carcinogenic effect in natural resources. Investigation of some new semiconductor materials and their photocatalytic properties for removal of pollutants is a challenging work. However, limited usage of photoactive materials still requires the testing of new materials with photoactive properties. The current work introduces the swift and easy approach for synthesis of (metal–free) N–doped carbon quantum dots in water using microwave reactor. Synthesis was performed from glucose water solution by heating in microwave reactor for only 1 min, at low temperature and applied microwave power. The synthesized N–doped carbon quantum dots show remarkable photocatalytic activity for removal of toxic organic dye (Rose Bengal) under visible light irradiation. Almost 93% of the dye degradation is achieved after only 30 min of radiation. The uninspected result, that the pH of the medium has a significant effect on the performance of the synthesized material in the presence of organic dye, indicates that dots show dual behavior. In the neutral and basic conditions, they have the ability to degrade organic dye, whereas, by shifting the medium pH into acidic medium, they form a stable conjugate with Rose Bengal. © 2019 Elsevier Ltd and Techna Group S.r.l.
T2  - Ceramics International
T1  - Green and facile microwave assisted synthesis of (metal-free) N-doped carbon quantum dots for catalytic applications
VL  - 45
IS  - 14
SP  - 17006
EP  - 17013
DO  - 10.1016/j.ceramint.2019.05.250
ER  - 

@article{
author = "Prekodravac, Jovana and Vasiljević, Bojana and Marković, Zoran M. and Jovanović, Dragana J. and Kleut, Duška and Špitalsky, Zdenko and Mičušik, Matej and Danko, Martin and Bajuk-Bogdanović, Danica V. and Todorović-Marković, Biljana",
year = "2019",
abstract = "Industrialization today leads to a significant increase in the environmental pollution, with number of phenols, pesticides, paints, solvents and other organic pollutants with potentially carcinogenic effect in natural resources. Investigation of some new semiconductor materials and their photocatalytic properties for removal of pollutants is a challenging work. However, limited usage of photoactive materials still requires the testing of new materials with photoactive properties. The current work introduces the swift and easy approach for synthesis of (metal–free) N–doped carbon quantum dots in water using microwave reactor. Synthesis was performed from glucose water solution by heating in microwave reactor for only 1 min, at low temperature and applied microwave power. The synthesized N–doped carbon quantum dots show remarkable photocatalytic activity for removal of toxic organic dye (Rose Bengal) under visible light irradiation. Almost 93% of the dye degradation is achieved after only 30 min of radiation. The uninspected result, that the pH of the medium has a significant effect on the performance of the synthesized material in the presence of organic dye, indicates that dots show dual behavior. In the neutral and basic conditions, they have the ability to degrade organic dye, whereas, by shifting the medium pH into acidic medium, they form a stable conjugate with Rose Bengal. © 2019 Elsevier Ltd and Techna Group S.r.l.",
journal = "Ceramics International",
title = "Green and facile microwave assisted synthesis of (metal-free) N-doped carbon quantum dots for catalytic applications",
volume = "45",
number = "14",
pages = "17006-17013",
doi = "10.1016/j.ceramint.2019.05.250"
}

Prekodravac, J., Vasiljević, B., Marković, Z. M., Jovanović, D. J., Kleut, D., Špitalsky, Z., Mičušik, M., Danko, M., Bajuk-Bogdanović, D. V.,& Todorović-Marković, B.. (2019). Green and facile microwave assisted synthesis of (metal-free) N-doped carbon quantum dots for catalytic applications. in Ceramics International, 45(14), 17006-17013.
https://doi.org/10.1016/j.ceramint.2019.05.250

Prekodravac J, Vasiljević B, Marković ZM, Jovanović DJ, Kleut D, Špitalsky Z, Mičušik M, Danko M, Bajuk-Bogdanović DV, Todorović-Marković B. Green and facile microwave assisted synthesis of (metal-free) N-doped carbon quantum dots for catalytic applications. in Ceramics International. 2019;45(14):17006-17013.
doi:10.1016/j.ceramint.2019.05.250 .

Prekodravac, Jovana, Vasiljević, Bojana, Marković, Zoran M., Jovanović, Dragana J., Kleut, Duška, Špitalsky, Zdenko, Mičušik, Matej, Danko, Martin, Bajuk-Bogdanović, Danica V., Todorović-Marković, Biljana, "Green and facile microwave assisted synthesis of (metal-free) N-doped carbon quantum dots for catalytic applications" in Ceramics International, 45, no. 14 (2019):17006-17013,
https://doi.org/10.1016/j.ceramint.2019.05.250 . .

TY  - JOUR
AU  - Jovanović, Svetlana P.
AU  - Marković, Zoran M.
AU  - Kleut, Duška
AU  - Dramićanin, Miroslav
AU  - Holclajtner-Antunović, Ivanka D.
AU  - Milosavljević, Momir
AU  - La Parola, Valeria
AU  - Syrgiannis, Zois
AU  - Todorović-Marković, Biljana
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6085
AB  - Single wall carbon nanotubes (SWCNTs) were exposed to gamma irradiation in oxidative (H2O, NH4OH) and reductive (H2O and NH4OH both mixed with isopropyl alcohol) media. The structure has been investigated with microscopic (atomic force and transmission electron microscopy), spectroscopic (Raman, X-ray photoelectron, and FTIR spectroscopy) techniques, and by thermogravimetric analysis. Reductive media offer the possibility for green chemistry reduction of SWCNTs: after gamma irradiation, SWCNTs lose C-O bonds. Furthermore, irradiation in these media increases the fraction of sp(2) hybridized carbon atoms in structure of SWCNTs and prevents their amorphization. The presence of isopropyl alcohol in reductive media contributed to the preservation of structures unity. On the other hand, the most effective procedure is the one that occurs in oxidative media and yields in debundled, cut, and annihilated carbon nanotubes. The smaller diameter and the metallic ones are the most affected.
T2  - Journal of Physical Chemistry. C
T1  - Structural Analysis of Single Wall Carbon Nanotubes Exposed to Oxidation and Reduction Conditions in the Course of Gamma Irradiation
VL  - 118
IS  - 29
SP  - 16147
EP  - 16155
DO  - 10.1021/jp502685n
ER  - 

@article{
author = "Jovanović, Svetlana P. and Marković, Zoran M. and Kleut, Duška and Dramićanin, Miroslav and Holclajtner-Antunović, Ivanka D. and Milosavljević, Momir and La Parola, Valeria and Syrgiannis, Zois and Todorović-Marković, Biljana",
year = "2014",
abstract = "Single wall carbon nanotubes (SWCNTs) were exposed to gamma irradiation in oxidative (H2O, NH4OH) and reductive (H2O and NH4OH both mixed with isopropyl alcohol) media. The structure has been investigated with microscopic (atomic force and transmission electron microscopy), spectroscopic (Raman, X-ray photoelectron, and FTIR spectroscopy) techniques, and by thermogravimetric analysis. Reductive media offer the possibility for green chemistry reduction of SWCNTs: after gamma irradiation, SWCNTs lose C-O bonds. Furthermore, irradiation in these media increases the fraction of sp(2) hybridized carbon atoms in structure of SWCNTs and prevents their amorphization. The presence of isopropyl alcohol in reductive media contributed to the preservation of structures unity. On the other hand, the most effective procedure is the one that occurs in oxidative media and yields in debundled, cut, and annihilated carbon nanotubes. The smaller diameter and the metallic ones are the most affected.",
journal = "Journal of Physical Chemistry. C",
title = "Structural Analysis of Single Wall Carbon Nanotubes Exposed to Oxidation and Reduction Conditions in the Course of Gamma Irradiation",
volume = "118",
number = "29",
pages = "16147-16155",
doi = "10.1021/jp502685n"
}

Jovanović, S. P., Marković, Z. M., Kleut, D., Dramićanin, M., Holclajtner-Antunović, I. D., Milosavljević, M., La Parola, V., Syrgiannis, Z.,& Todorović-Marković, B.. (2014). Structural Analysis of Single Wall Carbon Nanotubes Exposed to Oxidation and Reduction Conditions in the Course of Gamma Irradiation. in Journal of Physical Chemistry. C, 118(29), 16147-16155.
https://doi.org/10.1021/jp502685n

Jovanović SP, Marković ZM, Kleut D, Dramićanin M, Holclajtner-Antunović ID, Milosavljević M, La Parola V, Syrgiannis Z, Todorović-Marković B. Structural Analysis of Single Wall Carbon Nanotubes Exposed to Oxidation and Reduction Conditions in the Course of Gamma Irradiation. in Journal of Physical Chemistry. C. 2014;118(29):16147-16155.
doi:10.1021/jp502685n .

Jovanović, Svetlana P., Marković, Zoran M., Kleut, Duška, Dramićanin, Miroslav, Holclajtner-Antunović, Ivanka D., Milosavljević, Momir, La Parola, Valeria, Syrgiannis, Zois, Todorović-Marković, Biljana, "Structural Analysis of Single Wall Carbon Nanotubes Exposed to Oxidation and Reduction Conditions in the Course of Gamma Irradiation" in Journal of Physical Chemistry. C, 118, no. 29 (2014):16147-16155,
https://doi.org/10.1021/jp502685n . .

TY  - JOUR
AU  - Kepić, Dejan P.
AU  - Marković, Zoran M.
AU  - Jovanović, Svetlana P.
AU  - Holclajtner-Antunović, Ivanka D.
AU  - Kleut, Duška
AU  - Todorović-Marković, Biljana
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7061
AB  - In this paper we present a novel method to obtain a stable dispersion of graphene in water using carbon quantum dots as surface active agents. In this way it is possible to achieve graphene concentrations in dispersion up to 2.7 mg ml(-1). Fourier transform infrared spectroscopy and UV-Vis measurements confirmed the presence of oxygen-containing functional groups in the graphene-carbon quantum dot (gCQD) structure, responsible for its good solubility in water. The stability of the gCQD dispersion is due to pi-pi interactions formed between graphene and graphene-like sites of carbon quantum dots. According to Raman spectroscopy, as well as transmission electron microscopy and atomic force microscopy analysis, graphene sheets consist of several layers.
T2  - Physica Scripta
T1  - Novel method for graphene functionalization
VL  - T162
DO  - 10.1088/0031-8949/2014/T162/014024
ER  - 

@article{
author = "Kepić, Dejan P. and Marković, Zoran M. and Jovanović, Svetlana P. and Holclajtner-Antunović, Ivanka D. and Kleut, Duška and Todorović-Marković, Biljana",
year = "2014",
abstract = "In this paper we present a novel method to obtain a stable dispersion of graphene in water using carbon quantum dots as surface active agents. In this way it is possible to achieve graphene concentrations in dispersion up to 2.7 mg ml(-1). Fourier transform infrared spectroscopy and UV-Vis measurements confirmed the presence of oxygen-containing functional groups in the graphene-carbon quantum dot (gCQD) structure, responsible for its good solubility in water. The stability of the gCQD dispersion is due to pi-pi interactions formed between graphene and graphene-like sites of carbon quantum dots. According to Raman spectroscopy, as well as transmission electron microscopy and atomic force microscopy analysis, graphene sheets consist of several layers.",
journal = "Physica Scripta",
title = "Novel method for graphene functionalization",
volume = "T162",
doi = "10.1088/0031-8949/2014/T162/014024"
}

Kepić, D. P., Marković, Z. M., Jovanović, S. P., Holclajtner-Antunović, I. D., Kleut, D.,& Todorović-Marković, B.. (2014). Novel method for graphene functionalization. in Physica Scripta, T162.
https://doi.org/10.1088/0031-8949/2014/T162/014024

Kepić DP, Marković ZM, Jovanović SP, Holclajtner-Antunović ID, Kleut D, Todorović-Marković B. Novel method for graphene functionalization. in Physica Scripta. 2014;T162.
doi:10.1088/0031-8949/2014/T162/014024 .

Kepić, Dejan P., Marković, Zoran M., Jovanović, Svetlana P., Holclajtner-Antunović, Ivanka D., Kleut, Duška, Todorović-Marković, Biljana, "Novel method for graphene functionalization" in Physica Scripta, T162 (2014),
https://doi.org/10.1088/0031-8949/2014/T162/014024 . .

TY  - JOUR
AU  - Kleut, Duška
AU  - Marković, Zoran M.
AU  - Holclajtner-Antunović, Ivanka D.
AU  - Dramićanin, Miroslav
AU  - Kepić, Dejan P.
AU  - Todorović-Marković, Biljana
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7062
AB  - This paper represents results of a Raman spectroscopy study of gamma-irradiated few-layer graphene thin films at three different doses: 25, 50 and 110 kGy. Graphene thin films were deposited by the vacuum filtration method and then transferred onto glass substrate. Raman spectroscopy and atomic force microscopy analysis have shown that the average in-plane crystallite size La of graphene thin films varies slightly when an irradiation dose is applied. Raman spectroscopy revealed that gamma irradiation of graphene thin films resulted in slight p-doping of the graphene thin film surface. It was found that during gamma irradiation at a dose of 110 kGy, the graphene sheets merged. As a result, the number of incorporated defects in the graphene structure was reduced (the ID/IG ratio decreased with the increase in the applied dose).
T2  - Physica Scripta
T1  - Gamma ray-assisted irradiation of few-layer graphene films: a Raman spectroscopy study
VL  - T162
DO  - 10.1088/0031-8949/2014/T162/014025
ER  - 

@article{
author = "Kleut, Duška and Marković, Zoran M. and Holclajtner-Antunović, Ivanka D. and Dramićanin, Miroslav and Kepić, Dejan P. and Todorović-Marković, Biljana",
year = "2014",
abstract = "This paper represents results of a Raman spectroscopy study of gamma-irradiated few-layer graphene thin films at three different doses: 25, 50 and 110 kGy. Graphene thin films were deposited by the vacuum filtration method and then transferred onto glass substrate. Raman spectroscopy and atomic force microscopy analysis have shown that the average in-plane crystallite size La of graphene thin films varies slightly when an irradiation dose is applied. Raman spectroscopy revealed that gamma irradiation of graphene thin films resulted in slight p-doping of the graphene thin film surface. It was found that during gamma irradiation at a dose of 110 kGy, the graphene sheets merged. As a result, the number of incorporated defects in the graphene structure was reduced (the ID/IG ratio decreased with the increase in the applied dose).",
journal = "Physica Scripta",
title = "Gamma ray-assisted irradiation of few-layer graphene films: a Raman spectroscopy study",
volume = "T162",
doi = "10.1088/0031-8949/2014/T162/014025"
}

Kleut, D., Marković, Z. M., Holclajtner-Antunović, I. D., Dramićanin, M., Kepić, D. P.,& Todorović-Marković, B.. (2014). Gamma ray-assisted irradiation of few-layer graphene films: a Raman spectroscopy study. in Physica Scripta, T162.
https://doi.org/10.1088/0031-8949/2014/T162/014025

Kleut D, Marković ZM, Holclajtner-Antunović ID, Dramićanin M, Kepić DP, Todorović-Marković B. Gamma ray-assisted irradiation of few-layer graphene films: a Raman spectroscopy study. in Physica Scripta. 2014;T162.
doi:10.1088/0031-8949/2014/T162/014025 .

Kleut, Duška, Marković, Zoran M., Holclajtner-Antunović, Ivanka D., Dramićanin, Miroslav, Kepić, Dejan P., Todorović-Marković, Biljana, "Gamma ray-assisted irradiation of few-layer graphene films: a Raman spectroscopy study" in Physica Scripta, T162 (2014),
https://doi.org/10.1088/0031-8949/2014/T162/014025 . .

TY  - JOUR
AU  - Kleut, Duška
AU  - Marković, Zoran M.
AU  - Babić, Biljana M.
AU  - Holclajtner-Antunović, Ivanka D.
AU  - Milosavljević, Momir
AU  - Dramićanin, Miroslav
AU  - Todorović-Marković, Biljana
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7021
AB  - In this work, we investigated the properties of carbon resorcinol-formaldehyde (RF) cryogel thin films. RF cryogels were doped by single-wall carbon nanotubes, graphene and graphene quantum dots. The structure of the deposited films was investigated by Raman spectroscopy, and optical, transmission electron and atomic force microscopy. Raman spectroscopy was performed using three excitation laser energies in the visible range. The effect of glass substrate on the Raman features of investigated carbon cryogel thin films was determined as well. The particle size of the carbon-doped RF cryogel thin films was determined by atomic force microscopy.
T2  - Physica Scripta
T1  - Raman spectroscopy study of carbon-doped resorcinol-formaldehyde thin films
VL  - T157
DO  - 10.1088/0031-8949/2013/T157/014039
ER  - 

@article{
author = "Kleut, Duška and Marković, Zoran M. and Babić, Biljana M. and Holclajtner-Antunović, Ivanka D. and Milosavljević, Momir and Dramićanin, Miroslav and Todorović-Marković, Biljana",
year = "2013",
abstract = "In this work, we investigated the properties of carbon resorcinol-formaldehyde (RF) cryogel thin films. RF cryogels were doped by single-wall carbon nanotubes, graphene and graphene quantum dots. The structure of the deposited films was investigated by Raman spectroscopy, and optical, transmission electron and atomic force microscopy. Raman spectroscopy was performed using three excitation laser energies in the visible range. The effect of glass substrate on the Raman features of investigated carbon cryogel thin films was determined as well. The particle size of the carbon-doped RF cryogel thin films was determined by atomic force microscopy.",
journal = "Physica Scripta",
title = "Raman spectroscopy study of carbon-doped resorcinol-formaldehyde thin films",
volume = "T157",
doi = "10.1088/0031-8949/2013/T157/014039"
}

Kleut, D., Marković, Z. M., Babić, B. M., Holclajtner-Antunović, I. D., Milosavljević, M., Dramićanin, M.,& Todorović-Marković, B.. (2013). Raman spectroscopy study of carbon-doped resorcinol-formaldehyde thin films. in Physica Scripta, T157.
https://doi.org/10.1088/0031-8949/2013/T157/014039

Kleut D, Marković ZM, Babić BM, Holclajtner-Antunović ID, Milosavljević M, Dramićanin M, Todorović-Marković B. Raman spectroscopy study of carbon-doped resorcinol-formaldehyde thin films. in Physica Scripta. 2013;T157.
doi:10.1088/0031-8949/2013/T157/014039 .

Kleut, Duška, Marković, Zoran M., Babić, Biljana M., Holclajtner-Antunović, Ivanka D., Milosavljević, Momir, Dramićanin, Miroslav, Todorović-Marković, Biljana, "Raman spectroscopy study of carbon-doped resorcinol-formaldehyde thin films" in Physica Scripta, T157 (2013),
https://doi.org/10.1088/0031-8949/2013/T157/014039 . .

TY  - JOUR
AU  - Kepić, Dejan P.
AU  - Marković, Zoran M.
AU  - Tošić, Dragana
AU  - Holclajtner-Antunović, Ivanka D.
AU  - Adnađević, Borivoj
AU  - Prekodravac, Jovana
AU  - Kleut, Duška
AU  - Dramićanin, Miroslav
AU  - Todorović-Marković, Biljana
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7022
AB  - In this work, we present the results of a Raman spectroscopy study of single-wall carbon nanotube (SWCNT) thin films treated with microwave irradiation. SWCNT thin films were deposited by the vacuum filtration method and transferred onto alumina substrate. These thin films were exposed to microwave irradiation of 25 and 250 W at 2.45 GHz. All samples were characterized by Raman spectroscopy and atomic force microscopy. Raman spectroscopy analysis showed that there was neither selective destruction of metallic nor semiconducting nanotubes. It was noticed that samples were heated only during microwave irradiation at 250 W. The major effect of microwave irradiation on SWCNTs was their debundling.
T2  - Physica Scripta
T1  - Surface modification of single-wall carbon nanotube thin films irradiated by microwaves: a Raman spectroscopy study
VL  - T157
DO  - 10.1088/0031-8949/2013/T157/014040
ER  - 

@article{
author = "Kepić, Dejan P. and Marković, Zoran M. and Tošić, Dragana and Holclajtner-Antunović, Ivanka D. and Adnađević, Borivoj and Prekodravac, Jovana and Kleut, Duška and Dramićanin, Miroslav and Todorović-Marković, Biljana",
year = "2013",
abstract = "In this work, we present the results of a Raman spectroscopy study of single-wall carbon nanotube (SWCNT) thin films treated with microwave irradiation. SWCNT thin films were deposited by the vacuum filtration method and transferred onto alumina substrate. These thin films were exposed to microwave irradiation of 25 and 250 W at 2.45 GHz. All samples were characterized by Raman spectroscopy and atomic force microscopy. Raman spectroscopy analysis showed that there was neither selective destruction of metallic nor semiconducting nanotubes. It was noticed that samples were heated only during microwave irradiation at 250 W. The major effect of microwave irradiation on SWCNTs was their debundling.",
journal = "Physica Scripta",
title = "Surface modification of single-wall carbon nanotube thin films irradiated by microwaves: a Raman spectroscopy study",
volume = "T157",
doi = "10.1088/0031-8949/2013/T157/014040"
}

Kepić, D. P., Marković, Z. M., Tošić, D., Holclajtner-Antunović, I. D., Adnađević, B., Prekodravac, J., Kleut, D., Dramićanin, M.,& Todorović-Marković, B.. (2013). Surface modification of single-wall carbon nanotube thin films irradiated by microwaves: a Raman spectroscopy study. in Physica Scripta, T157.
https://doi.org/10.1088/0031-8949/2013/T157/014040

Kepić DP, Marković ZM, Tošić D, Holclajtner-Antunović ID, Adnađević B, Prekodravac J, Kleut D, Dramićanin M, Todorović-Marković B. Surface modification of single-wall carbon nanotube thin films irradiated by microwaves: a Raman spectroscopy study. in Physica Scripta. 2013;T157.
doi:10.1088/0031-8949/2013/T157/014040 .

Kepić, Dejan P., Marković, Zoran M., Tošić, Dragana, Holclajtner-Antunović, Ivanka D., Adnađević, Borivoj, Prekodravac, Jovana, Kleut, Duška, Dramićanin, Miroslav, Todorović-Marković, Biljana, "Surface modification of single-wall carbon nanotube thin films irradiated by microwaves: a Raman spectroscopy study" in Physica Scripta, T157 (2013),
https://doi.org/10.1088/0031-8949/2013/T157/014040 . .

TY  - JOUR
AU  - Kleut, Duška
AU  - Jovanović, Svetlana P.
AU  - Marković, Zoran M.
AU  - Kepić, Dejan P.
AU  - Tošić, Dragana
AU  - Romčević, Nebojša Ž.
AU  - Marinović-Cincović, Milena
AU  - Dramićanin, Miroslav
AU  - Holclajtner-Antunović, Ivanka D.
AU  - Pavlović, Vladimir B.
AU  - Dražić, Goran
AU  - Milosavljević, Momir
AU  - Todorović-Marković, Biljana
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5047
AB  - A systematic study of the gamma irradiation effects on single wall carbon nanotube (SWCNT) structure was conducted. Nanotubes were exposed to different doses of gamma irradiation in three media. Irradiation was carried out in air, water and aqueous ammonia. Thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), elemental analysis (EA) and Raman spectroscopy confirmed the changes in the SWCNT structure. TGA measurements showed the highest percentage of introduced groups for the SWCNTs irradiated with 100 kGy. FTIR spectroscopy provided evidence for the attachment of hydroxyl, carboxyl and nitrile functional groups to the SWCNT sidewalls. Those groups were confirmed by EA. All irradiated SWCNTs had hydroxyl and carboxyl groups irrelevant to media used for irradiation, but nitrile functional groups were only identified in SWCNTs irradiated in aqueous ammonia. Raman spectroscopy indicated that the degree of disorder in the carbon nanotube structure correlates with the irradiation dose. For the nanotubes irradiated with the dose of 100 kGy, the Raman I-D/I-G ratio was three times higher than for the pristine ones. Atomic force microscopy showed a 50% decrease in nanotube length at a radiation dose of 100 kGy. Scanning and transmission electron microscopies showed significant changes in the morphology and structure of gamma irradiated SWCNTs. (C) 2012 Elsevier Inc. All rights reserved.
T2  - Materials Characterization
T1  - Comparison of structural properties of pristine and gamma irradiated single-wall carbon nanotubes: Effects of medium and irradiation dose
VL  - 72
SP  - 37
EP  - 45
DO  - 10.1016/j.matchar.2012.07.002
ER  - 

@article{
author = "Kleut, Duška and Jovanović, Svetlana P. and Marković, Zoran M. and Kepić, Dejan P. and Tošić, Dragana and Romčević, Nebojša Ž. and Marinović-Cincović, Milena and Dramićanin, Miroslav and Holclajtner-Antunović, Ivanka D. and Pavlović, Vladimir B. and Dražić, Goran and Milosavljević, Momir and Todorović-Marković, Biljana",
year = "2012",
abstract = "A systematic study of the gamma irradiation effects on single wall carbon nanotube (SWCNT) structure was conducted. Nanotubes were exposed to different doses of gamma irradiation in three media. Irradiation was carried out in air, water and aqueous ammonia. Thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), elemental analysis (EA) and Raman spectroscopy confirmed the changes in the SWCNT structure. TGA measurements showed the highest percentage of introduced groups for the SWCNTs irradiated with 100 kGy. FTIR spectroscopy provided evidence for the attachment of hydroxyl, carboxyl and nitrile functional groups to the SWCNT sidewalls. Those groups were confirmed by EA. All irradiated SWCNTs had hydroxyl and carboxyl groups irrelevant to media used for irradiation, but nitrile functional groups were only identified in SWCNTs irradiated in aqueous ammonia. Raman spectroscopy indicated that the degree of disorder in the carbon nanotube structure correlates with the irradiation dose. For the nanotubes irradiated with the dose of 100 kGy, the Raman I-D/I-G ratio was three times higher than for the pristine ones. Atomic force microscopy showed a 50% decrease in nanotube length at a radiation dose of 100 kGy. Scanning and transmission electron microscopies showed significant changes in the morphology and structure of gamma irradiated SWCNTs. (C) 2012 Elsevier Inc. All rights reserved.",
journal = "Materials Characterization",
title = "Comparison of structural properties of pristine and gamma irradiated single-wall carbon nanotubes: Effects of medium and irradiation dose",
volume = "72",
pages = "37-45",
doi = "10.1016/j.matchar.2012.07.002"
}

Kleut, D., Jovanović, S. P., Marković, Z. M., Kepić, D. P., Tošić, D., Romčević, N. Ž., Marinović-Cincović, M., Dramićanin, M., Holclajtner-Antunović, I. D., Pavlović, V. B., Dražić, G., Milosavljević, M.,& Todorović-Marković, B.. (2012). Comparison of structural properties of pristine and gamma irradiated single-wall carbon nanotubes: Effects of medium and irradiation dose. in Materials Characterization, 72, 37-45.
https://doi.org/10.1016/j.matchar.2012.07.002

Kleut D, Jovanović SP, Marković ZM, Kepić DP, Tošić D, Romčević NŽ, Marinović-Cincović M, Dramićanin M, Holclajtner-Antunović ID, Pavlović VB, Dražić G, Milosavljević M, Todorović-Marković B. Comparison of structural properties of pristine and gamma irradiated single-wall carbon nanotubes: Effects of medium and irradiation dose. in Materials Characterization. 2012;72:37-45.
doi:10.1016/j.matchar.2012.07.002 .

Kleut, Duška, Jovanović, Svetlana P., Marković, Zoran M., Kepić, Dejan P., Tošić, Dragana, Romčević, Nebojša Ž., Marinović-Cincović, Milena, Dramićanin, Miroslav, Holclajtner-Antunović, Ivanka D., Pavlović, Vladimir B., Dražić, Goran, Milosavljević, Momir, Todorović-Marković, Biljana, "Comparison of structural properties of pristine and gamma irradiated single-wall carbon nanotubes: Effects of medium and irradiation dose" in Materials Characterization, 72 (2012):37-45,
https://doi.org/10.1016/j.matchar.2012.07.002 . .

TY  - JOUR
AU  - Jovanović, Svetlana P.
AU  - Marković, Zoran M.
AU  - Kleut, Duška
AU  - Tošić, Dragana
AU  - Kepić, Dejan P.
AU  - Marinović-Cincović, Milena
AU  - Holclajtner-Antunović, Ivanka D.
AU  - Todorović-Marković, Biljana
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4677
AB  - Single wall carbon nanotubes (SWCNTs) were exposed to gamma radiation, absorbing the doses of 25, 50 and 100 kGy in aqueous environment. After the irradiation treatment, the changes in the structure were studied using Fourier transform Infrared and Raman spectroscopy, thermogravimetric analysis and atomic force microscopy. Fourier Transform Infrared Spectroscopy has shown that the irradiation of SWCNTs in aqueous environment leads to covalent functionalization of SWCNTs. The irradiation of water leads to its radiolysis and the formation of free radical species of different types. These species react with nanotube sidewalls and in such way carboxylic and hydroxylic groups are covalently bonded to the sidewalls of SWCNTs. Thermogravimetric analysis was used to estimate the total amount of covalently bonded groups. The highest ratio of covalently bonded groups appears in nanotubes irradiated with the 100 kGy dose. Raman spectroscopy proved that the increase in irradiation doses leads to an increase of structural disorder of SWCNTs, presumably in the form of defects in carbon nanotube walls. Examination of I-D to I-G ratio shows a three times larger degree of structural disorder after the irradiation treatment with 100 kGy. The analysis of carbon nanotube Raman spectra RBM bands determined the presence of both semiconducting and metallic carbon nanotubes after gamma irradiation treatment. These measurements prove that gamma irradiation treatments have a nonselective effect regarding different chirality and therefore conductance of nanotubes. Atomic force microscopy shows a significant carbon nanotube shortening as the effect of gamma radiation treatment. Nanotubes with length between 500 nm and 1 mu m are predominant.
T2  - Hemijska industrija
T1  - Covalent Modification of Single Wall Carbon Nanotubes Upon Gamma Irradiation in Aqueous Media
VL  - 65
IS  - 5
SP  - 479
EP  - 487
DO  - 10.2298/HEMIND110531050J
ER  - 

@article{
author = "Jovanović, Svetlana P. and Marković, Zoran M. and Kleut, Duška and Tošić, Dragana and Kepić, Dejan P. and Marinović-Cincović, Milena and Holclajtner-Antunović, Ivanka D. and Todorović-Marković, Biljana",
year = "2011",
abstract = "Single wall carbon nanotubes (SWCNTs) were exposed to gamma radiation, absorbing the doses of 25, 50 and 100 kGy in aqueous environment. After the irradiation treatment, the changes in the structure were studied using Fourier transform Infrared and Raman spectroscopy, thermogravimetric analysis and atomic force microscopy. Fourier Transform Infrared Spectroscopy has shown that the irradiation of SWCNTs in aqueous environment leads to covalent functionalization of SWCNTs. The irradiation of water leads to its radiolysis and the formation of free radical species of different types. These species react with nanotube sidewalls and in such way carboxylic and hydroxylic groups are covalently bonded to the sidewalls of SWCNTs. Thermogravimetric analysis was used to estimate the total amount of covalently bonded groups. The highest ratio of covalently bonded groups appears in nanotubes irradiated with the 100 kGy dose. Raman spectroscopy proved that the increase in irradiation doses leads to an increase of structural disorder of SWCNTs, presumably in the form of defects in carbon nanotube walls. Examination of I-D to I-G ratio shows a three times larger degree of structural disorder after the irradiation treatment with 100 kGy. The analysis of carbon nanotube Raman spectra RBM bands determined the presence of both semiconducting and metallic carbon nanotubes after gamma irradiation treatment. These measurements prove that gamma irradiation treatments have a nonselective effect regarding different chirality and therefore conductance of nanotubes. Atomic force microscopy shows a significant carbon nanotube shortening as the effect of gamma radiation treatment. Nanotubes with length between 500 nm and 1 mu m are predominant.",
journal = "Hemijska industrija",
title = "Covalent Modification of Single Wall Carbon Nanotubes Upon Gamma Irradiation in Aqueous Media",
volume = "65",
number = "5",
pages = "479-487",
doi = "10.2298/HEMIND110531050J"
}

Jovanović, S. P., Marković, Z. M., Kleut, D., Tošić, D., Kepić, D. P., Marinović-Cincović, M., Holclajtner-Antunović, I. D.,& Todorović-Marković, B.. (2011). Covalent Modification of Single Wall Carbon Nanotubes Upon Gamma Irradiation in Aqueous Media. in Hemijska industrija, 65(5), 479-487.
https://doi.org/10.2298/HEMIND110531050J

Jovanović SP, Marković ZM, Kleut D, Tošić D, Kepić DP, Marinović-Cincović M, Holclajtner-Antunović ID, Todorović-Marković B. Covalent Modification of Single Wall Carbon Nanotubes Upon Gamma Irradiation in Aqueous Media. in Hemijska industrija. 2011;65(5):479-487.
doi:10.2298/HEMIND110531050J .

Jovanović, Svetlana P., Marković, Zoran M., Kleut, Duška, Tošić, Dragana, Kepić, Dejan P., Marinović-Cincović, Milena, Holclajtner-Antunović, Ivanka D., Todorović-Marković, Biljana, "Covalent Modification of Single Wall Carbon Nanotubes Upon Gamma Irradiation in Aqueous Media" in Hemijska industrija, 65, no. 5 (2011):479-487,
https://doi.org/10.2298/HEMIND110531050J . .

TY  - JOUR
AU  - Trpković, Andreja
AU  - Todorović-Marković, Biljana
AU  - Kleut, Duška
AU  - Misirkić, Maja
AU  - Janjetović, Kristina D.
AU  - Vucicevic, Ljubica
AU  - Pantovic, Aleksandar
AU  - Jovanović, Svetlana P.
AU  - Dramićanin, Miroslav
AU  - Marković, Zoran M.
AU  - Trajković, Vladimir S.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4093
AB  - The present study investigated the hemolytic properties of fullerene (C-60) nanoparticles prepared by solvent exchange using tetrahydrofuran (nC(60)THF), or by mechanochemically assisted complexation with macrocyclic oligosaccharide gamma-cyclodextrin (nC(60)CDX) or the copolymer ethylene vinyl acetate-ethylene vinyl versatate (nC(60)EVA-EVV). The spectrophotometrical analysis of hemoglobin release revealed that only nC(60)THF, but not nC(60)CDX or nC(60)EVA-EVV, was able to cause lysis of human erythrocytes in a dose-and time-dependent manner. Atomic force microscopy revealed that nC(60)THF-mediated hemolysis was preceded by erythrocyte shrinkage and increase in cell surface roughness. A flow cytometric analysis confirmed a decrease in erythrocyte size and demonstrated a significant increase in reactive oxygen species production in red blood cells exposed to nC(60)THF. The nC(60)THF-triggered hemolytic activity was efficiently reduced by the antioxidants N-acetylcysteine and butylated hydroxyanisole, as well as by serum albumin, the most abundant protein in human blood plasma. These data indicate that nC(60)THF can cause serum albumin-preventable hemolysis through oxidative stress-mediated damage of the erythrocyte membrane.
T2  - Nanotechnology
T1  - Oxidative stress-mediated hemolytic activity of solvent exchange-prepared fullerene (C-60) nanoparticles
VL  - 21
IS  - 37
DO  - 10.1088/0957-4484/21/37/375102
ER  - 

@article{
author = "Trpković, Andreja and Todorović-Marković, Biljana and Kleut, Duška and Misirkić, Maja and Janjetović, Kristina D. and Vucicevic, Ljubica and Pantovic, Aleksandar and Jovanović, Svetlana P. and Dramićanin, Miroslav and Marković, Zoran M. and Trajković, Vladimir S.",
year = "2010",
abstract = "The present study investigated the hemolytic properties of fullerene (C-60) nanoparticles prepared by solvent exchange using tetrahydrofuran (nC(60)THF), or by mechanochemically assisted complexation with macrocyclic oligosaccharide gamma-cyclodextrin (nC(60)CDX) or the copolymer ethylene vinyl acetate-ethylene vinyl versatate (nC(60)EVA-EVV). The spectrophotometrical analysis of hemoglobin release revealed that only nC(60)THF, but not nC(60)CDX or nC(60)EVA-EVV, was able to cause lysis of human erythrocytes in a dose-and time-dependent manner. Atomic force microscopy revealed that nC(60)THF-mediated hemolysis was preceded by erythrocyte shrinkage and increase in cell surface roughness. A flow cytometric analysis confirmed a decrease in erythrocyte size and demonstrated a significant increase in reactive oxygen species production in red blood cells exposed to nC(60)THF. The nC(60)THF-triggered hemolytic activity was efficiently reduced by the antioxidants N-acetylcysteine and butylated hydroxyanisole, as well as by serum albumin, the most abundant protein in human blood plasma. These data indicate that nC(60)THF can cause serum albumin-preventable hemolysis through oxidative stress-mediated damage of the erythrocyte membrane.",
journal = "Nanotechnology",
title = "Oxidative stress-mediated hemolytic activity of solvent exchange-prepared fullerene (C-60) nanoparticles",
volume = "21",
number = "37",
doi = "10.1088/0957-4484/21/37/375102"
}

Trpković, A., Todorović-Marković, B., Kleut, D., Misirkić, M., Janjetović, K. D., Vucicevic, L., Pantovic, A., Jovanović, S. P., Dramićanin, M., Marković, Z. M.,& Trajković, V. S.. (2010). Oxidative stress-mediated hemolytic activity of solvent exchange-prepared fullerene (C-60) nanoparticles. in Nanotechnology, 21(37).
https://doi.org/10.1088/0957-4484/21/37/375102

Trpković A, Todorović-Marković B, Kleut D, Misirkić M, Janjetović KD, Vucicevic L, Pantovic A, Jovanović SP, Dramićanin M, Marković ZM, Trajković VS. Oxidative stress-mediated hemolytic activity of solvent exchange-prepared fullerene (C-60) nanoparticles. in Nanotechnology. 2010;21(37).
doi:10.1088/0957-4484/21/37/375102 .

Trpković, Andreja, Todorović-Marković, Biljana, Kleut, Duška, Misirkić, Maja, Janjetović, Kristina D., Vucicevic, Ljubica, Pantovic, Aleksandar, Jovanović, Svetlana P., Dramićanin, Miroslav, Marković, Zoran M., Trajković, Vladimir S., "Oxidative stress-mediated hemolytic activity of solvent exchange-prepared fullerene (C-60) nanoparticles" in Nanotechnology, 21, no. 37 (2010),
https://doi.org/10.1088/0957-4484/21/37/375102 . .