TY  - JOUR
AU  - Jovanović, Svetlana
AU  - Dorontić, Slađana
AU  - Jovanović, Dragana
AU  - Ciasca, Gabriele
AU  - Budimir, Milica D.
AU  - Bonasera, Aurelio
AU  - Scopelliti, Michelangelo
AU  - Marković, Olivera S.
AU  - Todorović Marković, Biljana
PY  - 2020
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5466
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 suc cessfully 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 functio nalizing 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 are
herein reported. These results suggest that GQDs can be potentially applied as smart photoluminescent sensors
for metal cations.
PB  - Elsevier
T2  - Ceramics International
T1  - Gamma irradiation of graphene quantum dots with ethylenediamine: Antioxidant for ion sensing
VL  - 46
SP  - 23611
EP  - 23622
DO  - 10.1016/j.ceramint.2020.06.133
ER  - 

@article{
author = "Jovanović, Svetlana and Dorontić, Slađana and Jovanović, Dragana and Ciasca, Gabriele and Budimir, Milica D. and Bonasera, Aurelio and Scopelliti, Michelangelo and Marković, Olivera S. 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 suc cessfully 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 functio nalizing 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 are
herein reported. These results suggest that GQDs can be potentially applied as smart photoluminescent sensors
for metal cations.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Gamma irradiation of graphene quantum dots with ethylenediamine: Antioxidant for ion sensing",
volume = "46",
pages = "23611-23622",
doi = "10.1016/j.ceramint.2020.06.133"
}

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

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

Jovanović, Svetlana, Dorontić, Slađana, Jovanović, Dragana, Ciasca, Gabriele, Budimir, Milica D., Bonasera, Aurelio, Scopelliti, Michelangelo, Marković, Olivera S., Todorović Marković, Biljana, "Gamma irradiation of graphene quantum dots with ethylenediamine: Antioxidant for ion sensing" in Ceramics International, 46 (2020):23611-23622,
https://doi.org/10.1016/j.ceramint.2020.06.133 . .