Gamma irradiation of graphene quantum dots with ethylenediamine: Antioxidant for ion sensing
| Autor: | Biljana M. Todorović Marković, Svetlana Jovanovic, Olivera Markovic, Gabriele Ciasca, Milica D. Budimir, Dragana Jovanovic, Slađana Dorontić, Michelangelo Scopelliti, Aurelio Bonasera |
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| Přispěvatelé: | Jovanović, Svetlana, Dorontić, Slađana, Jovanović, Dragana, Ciasca, Gabriele, Budimir, Milica, Bonasera, Aurelio, Scopelliti, Michelangelo, Marković, Olivera, Todorović Marković, Biljana |
| Rok vydání: | 2020 |
| Předmět: |
Photoluminescence
Materials science Ethylenediamine 02 engineering and technology Photochemistry 01 natural sciences law.invention Ion Metal chemistry.chemical_compound law 0103 physical sciences Materials Chemistry Zeta potential Sensor 010302 applied physics Detection limit Chemical properties Optical properties Graphene Process Chemistry and Technology Carbon Chemical properties Optical properties Sensor 021001 nanoscience & nanotechnology Carbon Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Quantum dot visual_art Ceramics and Composites visual_art.visual_art_medium 0210 nano-technology |
| Zdroj: | Ceramics International |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2020.06.133 |
| Popis: | 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. This is the peer-reviewed version of the article: S. Jovanović, Slađ. Dorontić, D. Jovanović, G. Ciasca, M. Budimir, A. Bonasera, M. Scopelliti, O. Marković, B. Todorović Marković, Gamma irradiation of graphene quantum dots with ethylenediamine: Antioxidant for ion sensing, Ceramics International (2020), 46, 15, 23611-23622 DOI: [https://doi.org/10.1016/j.ceramint.2020.06.133] The published version: [http://cer.ihtm.bg.ac.rs/handle/123456789/3593] |
| Databáze: | OpenAIRE |
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