TY  - CONF
AU  - Dorontić, Slađana
AU  - Jovanović, Svetlana
AU  - Jovanović Vučetić, Svetlana
AU  - Todorović Marković, Biljana
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12321
AB  - Due to the exponential growth of bacterial infection as well as resistance toward most antibiotics, the development of new materials for treatment is urgently needed. In recent years, graphene quantum dots (GQDs) have been identified as promising carbon nanomaterial for eco-friendly antibacterial applications due to their optical and chemical stability, non-toxicity, and biocompatibility. One of the reported GQD’s antimicrobial mechanisms is the photo-induced production of singlet oxygen (1O2). Under light exposure, GQDs transfer the energy to molecular oxygen from the surrounding medium. Oxygen molecules transform to their excited form 1O2, which causes oxidative stress in bacterial cells and reduces their viability. In this study, pristine GQDs were produced in an easy, one-step electrochemical top-down approach using graphite electrodes as a starting material. Carboxyl groups of GQDs are modified using a carbodiimide coupling reaction catalyzed by 1-ethyl-3- (3-dimethylaminopropyl)carbodiimide (EDC), with ethylenediamine (EDA) as an amine. In the next step, these NH2 terminated dots were decorated with gold nanoparticles (AuNPs) by the same EDC coupling procedure. Abillity of GQDs-AuNP nanocomposite to generate singlet oxygen upon blue light (470 nm) was investigated by UV-Vis spectroscopy and 9,10- anthracenediylbis-(methylene)dimalonic acid (ABDA) as selective 1O2 traping agent. After 2 hours of blue light illumination, the band at 420 nm charachterisic for ABDA was completly disaperided only in the presence of the GQD-AuNPs indicating good prooxidative potential of composite. Photoinduced antibacterial effects of GQD-AuNPs were studied using minimum inhibitory concentration (MIC) test which showed great antibacterial activity against several bacterial strains.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts
T1  - Plasmon induced enhancement of photoinduced antibacterial activity of graphene quantum dots
SP  - 48
EP  - 48
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12321
ER  - 

@conference{
author = "Dorontić, Slađana and Jovanović, Svetlana and Jovanović Vučetić, Svetlana and Todorović Marković, Biljana",
year = "2023",
abstract = "Due to the exponential growth of bacterial infection as well as resistance toward most antibiotics, the development of new materials for treatment is urgently needed. In recent years, graphene quantum dots (GQDs) have been identified as promising carbon nanomaterial for eco-friendly antibacterial applications due to their optical and chemical stability, non-toxicity, and biocompatibility. One of the reported GQD’s antimicrobial mechanisms is the photo-induced production of singlet oxygen (1O2). Under light exposure, GQDs transfer the energy to molecular oxygen from the surrounding medium. Oxygen molecules transform to their excited form 1O2, which causes oxidative stress in bacterial cells and reduces their viability. In this study, pristine GQDs were produced in an easy, one-step electrochemical top-down approach using graphite electrodes as a starting material. Carboxyl groups of GQDs are modified using a carbodiimide coupling reaction catalyzed by 1-ethyl-3- (3-dimethylaminopropyl)carbodiimide (EDC), with ethylenediamine (EDA) as an amine. In the next step, these NH2 terminated dots were decorated with gold nanoparticles (AuNPs) by the same EDC coupling procedure. Abillity of GQDs-AuNP nanocomposite to generate singlet oxygen upon blue light (470 nm) was investigated by UV-Vis spectroscopy and 9,10- anthracenediylbis-(methylene)dimalonic acid (ABDA) as selective 1O2 traping agent. After 2 hours of blue light illumination, the band at 420 nm charachterisic for ABDA was completly disaperided only in the presence of the GQD-AuNPs indicating good prooxidative potential of composite. Photoinduced antibacterial effects of GQD-AuNPs were studied using minimum inhibitory concentration (MIC) test which showed great antibacterial activity against several bacterial strains.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts",
title = "Plasmon induced enhancement of photoinduced antibacterial activity of graphene quantum dots",
pages = "48-48",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12321"
}

Dorontić, S., Jovanović, S., Jovanović Vučetić, S.,& Todorović Marković, B.. (2023). Plasmon induced enhancement of photoinduced antibacterial activity of graphene quantum dots. in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts
Belgrade : Institute of Technical Sciences of SASA., 48-48.
https://hdl.handle.net/21.15107/rcub_vinar_12321

Dorontić S, Jovanović S, Jovanović Vučetić S, Todorović Marković B. Plasmon induced enhancement of photoinduced antibacterial activity of graphene quantum dots. in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts. 2023;:48-48.
https://hdl.handle.net/21.15107/rcub_vinar_12321 .

Dorontić, Slađana, Jovanović, Svetlana, Jovanović Vučetić, Svetlana, Todorović Marković, Biljana, "Plasmon induced enhancement of photoinduced antibacterial activity of graphene quantum dots" in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts (2023):48-48,
https://hdl.handle.net/21.15107/rcub_vinar_12321 .

TY  - CONF
AU  - Milenković, Mila
AU  - Dorontić, Slađana
AU  - Todorović Marković, Biljana
AU  - Jovanović, Svetlana
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12322
AB  - Considering the rising concern of antibiotic resistance, developing advanced antibacterial solutions is highly needed. The ability of graphene quantum dots (GQDs) to generate reactive oxygen species (ROS) upon light exposure made them promising candidates as agents in photodynamic therapy for combatting infections, including antibiotic-resistant strains. GQDs show versatile chemical, physical, and biological properties such as high fluorescent activity, resistance to photo-bleaching, low toxicity, excellent solubility, and biocompatibility. This research focused on exploring the ability of GQDs to produce singlet oxygen under blue light exposure. We used two singlet oxygen probes, 9,10-anthracenediylbis(methylene) dimalonic acid and 1,3-diphenylisobenzofuran to study photoinduced production radicals from several GQDs. To tune the ability of GQDs to generate ROS, we used gamma irradiation in two different media, the presence of L-cysteine and cyclopentanone. The results showed improvements in singlet oxygen production in both cases. However, the modification conducted with cyclopentanol showed notably higher efficacy in promoting singlet oxygen production. This research demonstrates the increasing significance of GQDs in discovering new methods to combat bacteria. The modification of GQDs with gamma irradiation leads to increased production of singlet oxygen enhancing the effectiveness of photodynamic therapy for treating infections.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts
T1  - Innovative modifications of graphene quantum dots for improved photodynamic therapy in antibacterial treatment
SP  - 49
EP  - 49
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12322
ER  - 

@conference{
author = "Milenković, Mila and Dorontić, Slađana and Todorović Marković, Biljana and Jovanović, Svetlana",
year = "2023",
abstract = "Considering the rising concern of antibiotic resistance, developing advanced antibacterial solutions is highly needed. The ability of graphene quantum dots (GQDs) to generate reactive oxygen species (ROS) upon light exposure made them promising candidates as agents in photodynamic therapy for combatting infections, including antibiotic-resistant strains. GQDs show versatile chemical, physical, and biological properties such as high fluorescent activity, resistance to photo-bleaching, low toxicity, excellent solubility, and biocompatibility. This research focused on exploring the ability of GQDs to produce singlet oxygen under blue light exposure. We used two singlet oxygen probes, 9,10-anthracenediylbis(methylene) dimalonic acid and 1,3-diphenylisobenzofuran to study photoinduced production radicals from several GQDs. To tune the ability of GQDs to generate ROS, we used gamma irradiation in two different media, the presence of L-cysteine and cyclopentanone. The results showed improvements in singlet oxygen production in both cases. However, the modification conducted with cyclopentanol showed notably higher efficacy in promoting singlet oxygen production. This research demonstrates the increasing significance of GQDs in discovering new methods to combat bacteria. The modification of GQDs with gamma irradiation leads to increased production of singlet oxygen enhancing the effectiveness of photodynamic therapy for treating infections.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts",
title = "Innovative modifications of graphene quantum dots for improved photodynamic therapy in antibacterial treatment",
pages = "49-49",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12322"
}

Milenković, M., Dorontić, S., Todorović Marković, B.,& Jovanović, S.. (2023). Innovative modifications of graphene quantum dots for improved photodynamic therapy in antibacterial treatment. in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts
Belgrade : Institute of Technical Sciences of SASA., 49-49.
https://hdl.handle.net/21.15107/rcub_vinar_12322

Milenković M, Dorontić S, Todorović Marković B, Jovanović S. Innovative modifications of graphene quantum dots for improved photodynamic therapy in antibacterial treatment. in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts. 2023;:49-49.
https://hdl.handle.net/21.15107/rcub_vinar_12322 .

Milenković, Mila, Dorontić, Slađana, Todorović Marković, Biljana, Jovanović, Svetlana, "Innovative modifications of graphene quantum dots for improved photodynamic therapy in antibacterial treatment" in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts (2023):49-49,
https://hdl.handle.net/21.15107/rcub_vinar_12322 .

TY  - CONF
AU  - Dorontić, Slađana
AU  - Milivojević, Dušan
AU  - Jovanović, Svetlana P.
AU  - Todorović-Marković, Biljana
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12504
PB  - Belgrade : Serbian Chemical Society
C3  - 9th Symposium Chemistry and Environmental Protection : Book of Abstracts
T1  - Photo-induced prooxidative and antioxidative properties of gamma-irradiated graphene quantum dots
SP  - 145
EP  - 146
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12504
ER  - 

@conference{
author = "Dorontić, Slađana and Milivojević, Dušan and Jovanović, Svetlana P. and Todorović-Marković, Biljana",
year = "2023",
publisher = "Belgrade : Serbian Chemical Society",
journal = "9th Symposium Chemistry and Environmental Protection : Book of Abstracts",
title = "Photo-induced prooxidative and antioxidative properties of gamma-irradiated graphene quantum dots",
pages = "145-146",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12504"
}

Dorontić, S., Milivojević, D., Jovanović, S. P.,& Todorović-Marković, B.. (2023). Photo-induced prooxidative and antioxidative properties of gamma-irradiated graphene quantum dots. in 9th Symposium Chemistry and Environmental Protection : Book of Abstracts
Belgrade : Serbian Chemical Society., 145-146.
https://hdl.handle.net/21.15107/rcub_vinar_12504

Dorontić S, Milivojević D, Jovanović SP, Todorović-Marković B. Photo-induced prooxidative and antioxidative properties of gamma-irradiated graphene quantum dots. in 9th Symposium Chemistry and Environmental Protection : Book of Abstracts. 2023;:145-146.
https://hdl.handle.net/21.15107/rcub_vinar_12504 .

Dorontić, Slađana, Milivojević, Dušan, Jovanović, Svetlana P., Todorović-Marković, Biljana, "Photo-induced prooxidative and antioxidative properties of gamma-irradiated graphene quantum dots" in 9th Symposium Chemistry and Environmental Protection : Book of Abstracts (2023):145-146,
https://hdl.handle.net/21.15107/rcub_vinar_12504 .

TY  - CONF
AU  - Dorontić, Slađana
AU  - Jovanović, Svetlana P.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12503
PB  - Belgrade : Serbian Chemical Society
C3  - 9th Symposium Chemistry and Environmental Protection : Book of Abstracts
T1  - Eco-friendly fabrication of graphene from apple biomass precursor
SP  - 143
EP  - 144
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12503
ER  - 

@conference{
author = "Dorontić, Slađana and Jovanović, Svetlana P.",
year = "2023",
publisher = "Belgrade : Serbian Chemical Society",
journal = "9th Symposium Chemistry and Environmental Protection : Book of Abstracts",
title = "Eco-friendly fabrication of graphene from apple biomass precursor",
pages = "143-144",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12503"
}

Dorontić, S.,& Jovanović, S. P.. (2023). Eco-friendly fabrication of graphene from apple biomass precursor. in 9th Symposium Chemistry and Environmental Protection : Book of Abstracts
Belgrade : Serbian Chemical Society., 143-144.
https://hdl.handle.net/21.15107/rcub_vinar_12503

Dorontić S, Jovanović SP. Eco-friendly fabrication of graphene from apple biomass precursor. in 9th Symposium Chemistry and Environmental Protection : Book of Abstracts. 2023;:143-144.
https://hdl.handle.net/21.15107/rcub_vinar_12503 .

Dorontić, Slađana, Jovanović, Svetlana P., "Eco-friendly fabrication of graphene from apple biomass precursor" in 9th Symposium Chemistry and Environmental Protection : Book of Abstracts (2023):143-144,
https://hdl.handle.net/21.15107/rcub_vinar_12503 .

TY  - JOUR
AU  - Dorontić, Slađana
AU  - Bonasera, Aurelio
AU  - Scopelliti, Michelangelo
AU  - Marković, Olivera
AU  - Bajuk Bogdanović, Danica
AU  - Ciasca, Gabriele
AU  - Romanò, Sabrina
AU  - Dimkić, Ivica
AU  - Budimir, Milica
AU  - Marinković, Dragana
AU  - Jovanović, Svetlana P.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10406
AB  - Structural modification of different carbon-based nanomaterials is often necessary toimprove their morphology and optical properties, particularly the incorporation of N-atoms ingraphene quantum dots (GQDs). Here, a clean, simple, one-step, and eco-friendly method forN-doping of GQDs using gamma irradiation is reported. GQDs were irradiated in the presenceof the different ethylenediamine (EDA) amounts (1 g, 5 g, and 10 g) and the highest % of N wasdetected in the presence of 10 g. N-doped GQDs emitted strong, blue photoluminescence (PL).Photoluminescence quantum yield was increased from 1.45, as obtained for non-irradiated dots,to 7.24% for those irradiated in the presence of 1 g of EDA. Modified GQDs were investigated asa PL probe for the detection of insecticide Carbofuran (2,2-Dimethyl-2,3-dihydro-1-benzofuran-7-yl methylcarbamate) and herbicide Amitrole (3-amino-1,2,4-triazole). The limit of detection was5.4 µmol L−1for Carbofuran. For the first time, Amitrole was detected by GQDs in a turn-off/turn-onmechanism using Pd(II) ions as a quenching agent. First, Pd(II) ions were quenched (turn-off) PLof GQDs, while after Amitrole addition, PL was recovered linearly with Amitrole concentration(turn-on). LOD was 2.03 µmol L−1. These results suggest that modified GQDs can be used as anefficient new material for Carbofuran and Amitrole detection. Furthermore, the phototoxicity of dotswas investigated on both Gram-positive and Gram-negative bacterial strains. When bacterial cellswere exposed to different GQD concentrations and illuminated with light of 470 nm wavelength, thetoxic effects were not observed.
T2  - Nanomaterials
T1  - Gamma-ray-induced structural transformation of GQDs towards the improvement of their optical properties, monitoring of selected toxic compounds, and photo-induced effect on bacterial strains
VL  - 12
SP  - 2714
DO  - 10.3390/nano12152714
ER  - 

@article{
author = "Dorontić, Slađana and Bonasera, Aurelio and Scopelliti, Michelangelo and Marković, Olivera and Bajuk Bogdanović, Danica and Ciasca, Gabriele and Romanò, Sabrina and Dimkić, Ivica and Budimir, Milica and Marinković, Dragana and Jovanović, Svetlana P.",
year = "2022",
abstract = "Structural modification of different carbon-based nanomaterials is often necessary toimprove their morphology and optical properties, particularly the incorporation of N-atoms ingraphene quantum dots (GQDs). Here, a clean, simple, one-step, and eco-friendly method forN-doping of GQDs using gamma irradiation is reported. GQDs were irradiated in the presenceof the different ethylenediamine (EDA) amounts (1 g, 5 g, and 10 g) and the highest % of N wasdetected in the presence of 10 g. N-doped GQDs emitted strong, blue photoluminescence (PL).Photoluminescence quantum yield was increased from 1.45, as obtained for non-irradiated dots,to 7.24% for those irradiated in the presence of 1 g of EDA. Modified GQDs were investigated asa PL probe for the detection of insecticide Carbofuran (2,2-Dimethyl-2,3-dihydro-1-benzofuran-7-yl methylcarbamate) and herbicide Amitrole (3-amino-1,2,4-triazole). The limit of detection was5.4 µmol L−1for Carbofuran. For the first time, Amitrole was detected by GQDs in a turn-off/turn-onmechanism using Pd(II) ions as a quenching agent. First, Pd(II) ions were quenched (turn-off) PLof GQDs, while after Amitrole addition, PL was recovered linearly with Amitrole concentration(turn-on). LOD was 2.03 µmol L−1. These results suggest that modified GQDs can be used as anefficient new material for Carbofuran and Amitrole detection. Furthermore, the phototoxicity of dotswas investigated on both Gram-positive and Gram-negative bacterial strains. When bacterial cellswere exposed to different GQD concentrations and illuminated with light of 470 nm wavelength, thetoxic effects were not observed.",
journal = "Nanomaterials",
title = "Gamma-ray-induced structural transformation of GQDs towards the improvement of their optical properties, monitoring of selected toxic compounds, and photo-induced effect on bacterial strains",
volume = "12",
pages = "2714",
doi = "10.3390/nano12152714"
}

Dorontić, S., Bonasera, A., Scopelliti, M., Marković, O., Bajuk Bogdanović, D., Ciasca, G., Romanò, S., Dimkić, I., Budimir, M., Marinković, D.,& Jovanović, S. P.. (2022). Gamma-ray-induced structural transformation of GQDs towards the improvement of their optical properties, monitoring of selected toxic compounds, and photo-induced effect on bacterial strains. in Nanomaterials, 12, 2714.
https://doi.org/10.3390/nano12152714

Dorontić S, Bonasera A, Scopelliti M, Marković O, Bajuk Bogdanović D, Ciasca G, Romanò S, Dimkić I, Budimir M, Marinković D, Jovanović SP. Gamma-ray-induced structural transformation of GQDs towards the improvement of their optical properties, monitoring of selected toxic compounds, and photo-induced effect on bacterial strains. in Nanomaterials. 2022;12:2714.
doi:10.3390/nano12152714 .

Dorontić, Slađana, Bonasera, Aurelio, Scopelliti, Michelangelo, Marković, Olivera, Bajuk Bogdanović, Danica, Ciasca, Gabriele, Romanò, Sabrina, Dimkić, Ivica, Budimir, Milica, Marinković, Dragana, Jovanović, Svetlana P., "Gamma-ray-induced structural transformation of GQDs towards the improvement of their optical properties, monitoring of selected toxic compounds, and photo-induced effect on bacterial strains" in Nanomaterials, 12 (2022):2714,
https://doi.org/10.3390/nano12152714 . .

TY  - JOUR
AU  - Jovanović, Svetlana P.
AU  - Bonasera, Aurelio
AU  - Dorontić, Slađana
AU  - Zmejkoski, Danica
AU  - Milivojević, Dušan
AU  - Janakiev, Tamara
AU  - Todorović-Marković, Biljana
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10633
AB  - Due to the increasing number of bacterial infections and the development of resistivity toward antibiotics, new materials and approaches for treatments must be urgently developed. The production of new materials should be ecologically friendly considering overall pollution with chemicals and economically acceptable and accessible to the wide population. Thus, the possibility of using biocompatible graphene quantum dots (GQDs) as an agent in photodynamic therapy was studied. First, dots were obtained using electrochemical cutting of graphite. In only one synthetic step using gamma irradiation, GQDs were doped with N atoms without any reagent. Obtained dots showed blue photoluminescence, with a diameter of 19–89 nm and optical band gap of 3.23–4.73 eV, featuring oxygen-containing, amino, and amide functional groups. Dots showed antioxidative activity; they quenched •OH at a concentration of 10 μg·mL−1, scavenged DPPH• radicals even at 5 μg·mL−1, and caused discoloration of KMnO4 at 30 μg·mL−1. Under light irradiation, dots were able to produce singlet oxygen, which remained stable for 10 min. Photoinduced effects by GQDs were studied on several bacterial strains (Listeria monocytogenes, Bacillus cereus, clinical strains of Streptococcus mutans, S. pyogenes, and S. sangunis, Pseudomonas aeruginosa, and one yeast strain Candida albicans) but antibacterial effects were not noticed.
T2  - Materials
T1  - Antioxidative and Photo-Induced Effects of Different Types of N-Doped Graphene Quantum Dots
VL  - 15
IS  - 19
SP  - 6525
DO  - 10.3390/ma15196525
ER  - 

@article{
author = "Jovanović, Svetlana P. and Bonasera, Aurelio and Dorontić, Slađana and Zmejkoski, Danica and Milivojević, Dušan and Janakiev, Tamara and Todorović-Marković, Biljana",
year = "2022",
abstract = "Due to the increasing number of bacterial infections and the development of resistivity toward antibiotics, new materials and approaches for treatments must be urgently developed. The production of new materials should be ecologically friendly considering overall pollution with chemicals and economically acceptable and accessible to the wide population. Thus, the possibility of using biocompatible graphene quantum dots (GQDs) as an agent in photodynamic therapy was studied. First, dots were obtained using electrochemical cutting of graphite. In only one synthetic step using gamma irradiation, GQDs were doped with N atoms without any reagent. Obtained dots showed blue photoluminescence, with a diameter of 19–89 nm and optical band gap of 3.23–4.73 eV, featuring oxygen-containing, amino, and amide functional groups. Dots showed antioxidative activity; they quenched •OH at a concentration of 10 μg·mL−1, scavenged DPPH• radicals even at 5 μg·mL−1, and caused discoloration of KMnO4 at 30 μg·mL−1. Under light irradiation, dots were able to produce singlet oxygen, which remained stable for 10 min. Photoinduced effects by GQDs were studied on several bacterial strains (Listeria monocytogenes, Bacillus cereus, clinical strains of Streptococcus mutans, S. pyogenes, and S. sangunis, Pseudomonas aeruginosa, and one yeast strain Candida albicans) but antibacterial effects were not noticed.",
journal = "Materials",
title = "Antioxidative and Photo-Induced Effects of Different Types of N-Doped Graphene Quantum Dots",
volume = "15",
number = "19",
pages = "6525",
doi = "10.3390/ma15196525"
}

Jovanović, S. P., Bonasera, A., Dorontić, S., Zmejkoski, D., Milivojević, D., Janakiev, T.,& Todorović-Marković, B.. (2022). Antioxidative and Photo-Induced Effects of Different Types of N-Doped Graphene Quantum Dots. in Materials, 15(19), 6525.
https://doi.org/10.3390/ma15196525

Jovanović SP, Bonasera A, Dorontić S, Zmejkoski D, Milivojević D, Janakiev T, Todorović-Marković B. Antioxidative and Photo-Induced Effects of Different Types of N-Doped Graphene Quantum Dots. in Materials. 2022;15(19):6525.
doi:10.3390/ma15196525 .

Jovanović, Svetlana P., Bonasera, Aurelio, Dorontić, Slađana, Zmejkoski, Danica, Milivojević, Dušan, Janakiev, Tamara, Todorović-Marković, Biljana, "Antioxidative and Photo-Induced Effects of Different Types of N-Doped Graphene Quantum Dots" in Materials, 15, no. 19 (2022):6525,
https://doi.org/10.3390/ma15196525 . .

TY  - CONF
AU  - Dorontić, Slađana
AU  - Sredojević, Dušan
AU  - Bajuk-Bogdanović, Danica
AU  - Jovanović, Svetlana P.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12498
AB  - The increasing presence of pesticides and heavy metals in the environment and their negative impact on human, animal, and plant health, demand green, low-cost, and simple methods for their monitoring. Due to photoluminescence (PL) in the visible part of the spectrum, biocompatibility, and ecological acceptability, graphene quantum dots (GQDs) are at the center of attention in the field of optical sensing. GQDs show great potential as PL sensors for Pd(II) ions and insecticide carbofuran. In this work, FTIR spectroscopy and Density Functional Theory (DFT) calculation were used to resolve the mechanism of PL change in the presence of these analytes.
PB  - Szeged : University of Szeged
C3  - 28th International Symposium on Analytical and Environmental Problems : Proceedings; November 14-15, 2022; Szeged, Hungary
T1  - The Mechanism Behind Pd(II) and Carbofuran-Induced Change of Graphene Quantum Dots Photoluminescence Intensity
SP  - 124
EP  - 128
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12498
ER  - 

@conference{
author = "Dorontić, Slađana and Sredojević, Dušan and Bajuk-Bogdanović, Danica and Jovanović, Svetlana P.",
year = "2022",
abstract = "The increasing presence of pesticides and heavy metals in the environment and their negative impact on human, animal, and plant health, demand green, low-cost, and simple methods for their monitoring. Due to photoluminescence (PL) in the visible part of the spectrum, biocompatibility, and ecological acceptability, graphene quantum dots (GQDs) are at the center of attention in the field of optical sensing. GQDs show great potential as PL sensors for Pd(II) ions and insecticide carbofuran. In this work, FTIR spectroscopy and Density Functional Theory (DFT) calculation were used to resolve the mechanism of PL change in the presence of these analytes.",
publisher = "Szeged : University of Szeged",
journal = "28th International Symposium on Analytical and Environmental Problems : Proceedings; November 14-15, 2022; Szeged, Hungary",
title = "The Mechanism Behind Pd(II) and Carbofuran-Induced Change of Graphene Quantum Dots Photoluminescence Intensity",
pages = "124-128",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12498"
}

Dorontić, S., Sredojević, D., Bajuk-Bogdanović, D.,& Jovanović, S. P.. (2022). The Mechanism Behind Pd(II) and Carbofuran-Induced Change of Graphene Quantum Dots Photoluminescence Intensity. in 28th International Symposium on Analytical and Environmental Problems : Proceedings; November 14-15, 2022; Szeged, Hungary
Szeged : University of Szeged., 124-128.
https://hdl.handle.net/21.15107/rcub_vinar_12498

Dorontić S, Sredojević D, Bajuk-Bogdanović D, Jovanović SP. The Mechanism Behind Pd(II) and Carbofuran-Induced Change of Graphene Quantum Dots Photoluminescence Intensity. in 28th International Symposium on Analytical and Environmental Problems : Proceedings; November 14-15, 2022; Szeged, Hungary. 2022;:124-128.
https://hdl.handle.net/21.15107/rcub_vinar_12498 .

Dorontić, Slađana, Sredojević, Dušan, Bajuk-Bogdanović, Danica, Jovanović, Svetlana P., "The Mechanism Behind Pd(II) and Carbofuran-Induced Change of Graphene Quantum Dots Photoluminescence Intensity" in 28th International Symposium on Analytical and Environmental Problems : Proceedings; November 14-15, 2022; Szeged, Hungary (2022):124-128,
https://hdl.handle.net/21.15107/rcub_vinar_12498 .

TY  - JOUR
AU  - Dorontić, Slađana
AU  - Bonasera, Aurelio
AU  - Scopelliti, Michelangelo
AU  - Mojsin, Marija
AU  - Stevanović, Milena J.
AU  - Marković, Olivera
AU  - Jovanović, Svetlana P.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10440
AB  - Large amounts of hazardous and toxic substances in the environment require non-toxic, cheap, easy, rapid, and sensitive methods for their detection. Blue luminescent graphene quantum dots (GQDs) were produced by electrochemical cleavage of graphite electrodes followed by gamma irradiation in the presence of ethylenediamine (EDA). Modified dots were able to detect metal ions (Co2+, Pd2+, Fe3+) due to photoluminescence quenching. The highest sensitivity was detected for the sample irradiated at a dose of 25 kGy. The limits of detection (LODs) were 1.79, 2.55, and 0.66 μmol L−1 for Co2+, Fe3+, and Pd2+, respectively. It was observed that GQDs irradiated at 200 kGy act as an ultra-sensitive turn-on probe for Malathion detection with LOD of 94 nmol L−1. Atomic force microscopy images proved the aggregation of GQDs in the presence of the investigated metal ions. Results obtained by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and LIVE/DEAD cytotoxicity test indicated that GQDs irradiated with EDA are not toxic towards MRC-5 cells, which makes them a promising, eco-friendly and safe material for sensing application.
T2  - Journal of Luminescence
T1  - Blue luminescent amino-functionalized graphene quantum dots as a responsive material for potential detection of metal ions and malathion
VL  - 252
SP  - 119311
DO  - 10.1016/j.jlumin.2022.119311
ER  - 

@article{
author = "Dorontić, Slađana and Bonasera, Aurelio and Scopelliti, Michelangelo and Mojsin, Marija and Stevanović, Milena J. and Marković, Olivera and Jovanović, Svetlana P.",
year = "2022",
abstract = "Large amounts of hazardous and toxic substances in the environment require non-toxic, cheap, easy, rapid, and sensitive methods for their detection. Blue luminescent graphene quantum dots (GQDs) were produced by electrochemical cleavage of graphite electrodes followed by gamma irradiation in the presence of ethylenediamine (EDA). Modified dots were able to detect metal ions (Co2+, Pd2+, Fe3+) due to photoluminescence quenching. The highest sensitivity was detected for the sample irradiated at a dose of 25 kGy. The limits of detection (LODs) were 1.79, 2.55, and 0.66 μmol L−1 for Co2+, Fe3+, and Pd2+, respectively. It was observed that GQDs irradiated at 200 kGy act as an ultra-sensitive turn-on probe for Malathion detection with LOD of 94 nmol L−1. Atomic force microscopy images proved the aggregation of GQDs in the presence of the investigated metal ions. Results obtained by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and LIVE/DEAD cytotoxicity test indicated that GQDs irradiated with EDA are not toxic towards MRC-5 cells, which makes them a promising, eco-friendly and safe material for sensing application.",
journal = "Journal of Luminescence",
title = "Blue luminescent amino-functionalized graphene quantum dots as a responsive material for potential detection of metal ions and malathion",
volume = "252",
pages = "119311",
doi = "10.1016/j.jlumin.2022.119311"
}

Dorontić, S., Bonasera, A., Scopelliti, M., Mojsin, M., Stevanović, M. J., Marković, O.,& Jovanović, S. P.. (2022). Blue luminescent amino-functionalized graphene quantum dots as a responsive material for potential detection of metal ions and malathion. in Journal of Luminescence, 252, 119311.
https://doi.org/10.1016/j.jlumin.2022.119311

Dorontić S, Bonasera A, Scopelliti M, Mojsin M, Stevanović MJ, Marković O, Jovanović SP. Blue luminescent amino-functionalized graphene quantum dots as a responsive material for potential detection of metal ions and malathion. in Journal of Luminescence. 2022;252:119311.
doi:10.1016/j.jlumin.2022.119311 .

Dorontić, Slađana, Bonasera, Aurelio, Scopelliti, Michelangelo, Mojsin, Marija, Stevanović, Milena J., Marković, Olivera, Jovanović, Svetlana P., "Blue luminescent amino-functionalized graphene quantum dots as a responsive material for potential detection of metal ions and malathion" in Journal of Luminescence, 252 (2022):119311,
https://doi.org/10.1016/j.jlumin.2022.119311 . .

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  - 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  - Dorontić, Slađana
AU  - Jovanović, Svetlana P.
AU  - Bonasera, Aurelio
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10040
AB  - During the last 20 years, the scientific community has shown growing interest towards carbonaceous nanomaterials due to their appealing mechanical, thermal, and optical features, depending on the specific nanoforms. Among these, graphene quantum dots (GQDs) recently emerged as one of the most promising nanomaterials due to their outstanding electrical properties, chemical stability, and intense and tunable photoluminescence, as it is witnessed by a booming number of reported applications, ranging from the biological field to the photovoltaic market. To date, a plethora of synthetic protocols have been investigated to modulate the portfolio of features that GQDs possess and to facilitate the use of these materials for target applications. Considering the number of publications and the rapid evolution of this flourishing field of research, this review aims at providing a broad overview of the most widely established synthetic protocols and offering a detailed review of some specific applications that are attracting researchers’ interest.
T2  - Materials
T1  - Shedding Light on Graphene Quantum Dots: Key Synthetic Strategies, Characterization Tools, and Cutting-Edge Applications
VL  - 14
IS  - 20
SP  - 6153
DO  - 10.3390/ma14206153
ER  - 

@article{
author = "Dorontić, Slađana and Jovanović, Svetlana P. and Bonasera, Aurelio",
year = "2021",
abstract = "During the last 20 years, the scientific community has shown growing interest towards carbonaceous nanomaterials due to their appealing mechanical, thermal, and optical features, depending on the specific nanoforms. Among these, graphene quantum dots (GQDs) recently emerged as one of the most promising nanomaterials due to their outstanding electrical properties, chemical stability, and intense and tunable photoluminescence, as it is witnessed by a booming number of reported applications, ranging from the biological field to the photovoltaic market. To date, a plethora of synthetic protocols have been investigated to modulate the portfolio of features that GQDs possess and to facilitate the use of these materials for target applications. Considering the number of publications and the rapid evolution of this flourishing field of research, this review aims at providing a broad overview of the most widely established synthetic protocols and offering a detailed review of some specific applications that are attracting researchers’ interest.",
journal = "Materials",
title = "Shedding Light on Graphene Quantum Dots: Key Synthetic Strategies, Characterization Tools, and Cutting-Edge Applications",
volume = "14",
number = "20",
pages = "6153",
doi = "10.3390/ma14206153"
}

Dorontić, S., Jovanović, S. P.,& Bonasera, A.. (2021). Shedding Light on Graphene Quantum Dots: Key Synthetic Strategies, Characterization Tools, and Cutting-Edge Applications. in Materials, 14(20), 6153.
https://doi.org/10.3390/ma14206153

Dorontić S, Jovanović SP, Bonasera A. Shedding Light on Graphene Quantum Dots: Key Synthetic Strategies, Characterization Tools, and Cutting-Edge Applications. in Materials. 2021;14(20):6153.
doi:10.3390/ma14206153 .

Dorontić, Slađana, Jovanović, Svetlana P., Bonasera, Aurelio, "Shedding Light on Graphene Quantum Dots: Key Synthetic Strategies, Characterization Tools, and Cutting-Edge Applications" in Materials, 14, no. 20 (2021):6153,
https://doi.org/10.3390/ma14206153 . .

TY  - JOUR
AU  - Jovanović, Svetlana P.
AU  - Dorontić, Slađana
AU  - Jovanović, Dragana J.
AU  - Ciasca, Gabriele
AU  - Budimir, Milica
AU  - Bonasera, Aurelio
AU  - Scopelliti, Michelangelo
AU  - Marković, Olivera
AU  - Todorović-Marković, Biljana
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9072
AB  - Due to the low consumption of chemicals, the absence of toxic residual side products, the procedure simplicity and time-saving aspects, gamma irradiation offers advantages over the classical chemical protocols. We successfully employed gamma irradiation in order to introduce N-atoms in Graphene Quantum Dots (GQDs). By irradiating GQDs water dispersions in the presence of isopropyl alcohol and ethylenediamine, at doses of 25, 50 and 200 kGy, we attached amino groups onto GQDs in a single synthetic step. At the same time, a chemical reduction is achieved, too. Selected conditions induced incorporation of N-atoms within GDQs atomic lattice (around 3 at%), at all applied doses. Additionally, the C-atoms percentage was highly increased, from 63 to 79 at % or higher. The zeta potential of dots changed from −34.6 to +9.1 mV, due to the modification of functionalizing groups localized at the surface. Produced chemical changes lead to the desired alteration of the GQDs optical properties, such as an increased photoluminescence intensity, a higher photoluminescence quantum yields (from 2.07 to 18.40%) and a narrowing of the spectral features in the emission spectra. The ability of gamma-irradiated GQDs to quench free radical species was investigated and positively assessed; additionally, non-enzymatic optical detection of Cu(II) ions using GQDs as a sensor was studied and the detection limits areherein reported. These results suggest that GQDs can be potentially applied as smart photoluminescent sensors for metal cations.
T2  - Ceramics International
T1  - Gamma irradiation of graphene quantum dots with ethylenediamine: Antioxidant for ion sensing
VL  - 46
IS  - 15
SP  - 23611
EP  - 23622
DO  - 10.1016/j.ceramint.2020.06.133
ER  - 

@article{
author = "Jovanović, Svetlana P. and Dorontić, Slađana and Jovanović, Dragana J. and Ciasca, Gabriele and Budimir, Milica and Bonasera, Aurelio and Scopelliti, Michelangelo and Marković, Olivera and Todorović-Marković, Biljana",
year = "2020",
abstract = "Due to the low consumption of chemicals, the absence of toxic residual side products, the procedure simplicity and time-saving aspects, gamma irradiation offers advantages over the classical chemical protocols. We successfully employed gamma irradiation in order to introduce N-atoms in Graphene Quantum Dots (GQDs). By irradiating GQDs water dispersions in the presence of isopropyl alcohol and ethylenediamine, at doses of 25, 50 and 200 kGy, we attached amino groups onto GQDs in a single synthetic step. At the same time, a chemical reduction is achieved, too. Selected conditions induced incorporation of N-atoms within GDQs atomic lattice (around 3 at%), at all applied doses. Additionally, the C-atoms percentage was highly increased, from 63 to 79 at % or higher. The zeta potential of dots changed from −34.6 to +9.1 mV, due to the modification of functionalizing groups localized at the surface. Produced chemical changes lead to the desired alteration of the GQDs optical properties, such as an increased photoluminescence intensity, a higher photoluminescence quantum yields (from 2.07 to 18.40%) and a narrowing of the spectral features in the emission spectra. The ability of gamma-irradiated GQDs to quench free radical species was investigated and positively assessed; additionally, non-enzymatic optical detection of Cu(II) ions using GQDs as a sensor was studied and the detection limits areherein reported. These results suggest that GQDs can be potentially applied as smart photoluminescent sensors for metal cations.",
journal = "Ceramics International",
title = "Gamma irradiation of graphene quantum dots with ethylenediamine: Antioxidant for ion sensing",
volume = "46",
number = "15",
pages = "23611-23622",
doi = "10.1016/j.ceramint.2020.06.133"
}

Jovanović, S. P., Dorontić, S., Jovanović, D. J., Ciasca, G., Budimir, M., Bonasera, A., Scopelliti, M., Marković, O.,& Todorović-Marković, B.. (2020). Gamma irradiation of graphene quantum dots with ethylenediamine: Antioxidant for ion sensing. in Ceramics International, 46(15), 23611-23622.
https://doi.org/10.1016/j.ceramint.2020.06.133

Jovanović SP, Dorontić S, Jovanović DJ, Ciasca G, Budimir M, Bonasera A, Scopelliti M, Marković O, Todorović-Marković B. Gamma irradiation of graphene quantum dots with ethylenediamine: Antioxidant for ion sensing. in Ceramics International. 2020;46(15):23611-23622.
doi:10.1016/j.ceramint.2020.06.133 .

Jovanović, Svetlana P., Dorontić, Slađana, Jovanović, Dragana J., Ciasca, Gabriele, Budimir, Milica, Bonasera, Aurelio, Scopelliti, Michelangelo, Marković, Olivera, Todorović-Marković, Biljana, "Gamma irradiation of graphene quantum dots with ethylenediamine: Antioxidant for ion sensing" in Ceramics International, 46, no. 15 (2020):23611-23622,
https://doi.org/10.1016/j.ceramint.2020.06.133 . .

TY  - CONF
AU  - Dorontić, Slađana
AU  - Marković, Olivera
AU  - Bonasera, Aurelio
AU  - Jovanović, Svetlana
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12496
AB  - Graphene Quantum Dots (GQDs) were produced using electrochemical oxidation of graphite rods. Obtained GQDs were gamma-irradiated in the presence of the N atoms source, ethylenediamine. Both structural and morphological changes were investigated using UV-Vis, X-ray photoelectron and photoluminescence (PL) spectroscopy as well as atomic force microscopy. The ability of both types of dots to change PL intensity in the presence of pesticides such as malathion and glyphosate, as well as copper (II) ions was detected. These preliminary results indicated a high potential of produced GQDs to be applied as non-enzymatic PL sensors for the detection of selected pesticides and metal ions.
PB  - Szeged : University of Szeged
C3  - 26th International Symposium on Analytical and Environmental Problems : Proceedings; November 23-24, 2020; Szeged, Hungary
T1  - Application of graphene quantum dots in heavy metals and pesticides detection
SP  - 179
EP  - 182
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12496
ER  - 

@conference{
author = "Dorontić, Slađana and Marković, Olivera and Bonasera, Aurelio and Jovanović, Svetlana",
year = "2020",
abstract = "Graphene Quantum Dots (GQDs) were produced using electrochemical oxidation of graphite rods. Obtained GQDs were gamma-irradiated in the presence of the N atoms source, ethylenediamine. Both structural and morphological changes were investigated using UV-Vis, X-ray photoelectron and photoluminescence (PL) spectroscopy as well as atomic force microscopy. The ability of both types of dots to change PL intensity in the presence of pesticides such as malathion and glyphosate, as well as copper (II) ions was detected. These preliminary results indicated a high potential of produced GQDs to be applied as non-enzymatic PL sensors for the detection of selected pesticides and metal ions.",
publisher = "Szeged : University of Szeged",
journal = "26th International Symposium on Analytical and Environmental Problems : Proceedings; November 23-24, 2020; Szeged, Hungary",
title = "Application of graphene quantum dots in heavy metals and pesticides detection",
pages = "179-182",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12496"
}

Dorontić, S., Marković, O., Bonasera, A.,& Jovanović, S.. (2020). Application of graphene quantum dots in heavy metals and pesticides detection. in 26th International Symposium on Analytical and Environmental Problems : Proceedings; November 23-24, 2020; Szeged, Hungary
Szeged : University of Szeged., 179-182.
https://hdl.handle.net/21.15107/rcub_vinar_12496

Dorontić S, Marković O, Bonasera A, Jovanović S. Application of graphene quantum dots in heavy metals and pesticides detection. in 26th International Symposium on Analytical and Environmental Problems : Proceedings; November 23-24, 2020; Szeged, Hungary. 2020;:179-182.
https://hdl.handle.net/21.15107/rcub_vinar_12496 .

Dorontić, Slađana, Marković, Olivera, Bonasera, Aurelio, Jovanović, Svetlana, "Application of graphene quantum dots in heavy metals and pesticides detection" in 26th International Symposium on Analytical and Environmental Problems : Proceedings; November 23-24, 2020; Szeged, Hungary (2020):179-182,
https://hdl.handle.net/21.15107/rcub_vinar_12496 .