Graphene oxide quantum dots immobilized on mesoporous silica: Preparation, characterization and electroanalytical application

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dc.contributor.authorMikhraliieva, Albina
dc.contributor.authorZaitsev, Vladimir
dc.contributor.authorTkachenko, Oleg
dc.contributor.authorNazarkovsky, Michael
dc.contributor.authorXing, Yutao
dc.contributor.authorBenvenutti, Edilson
dc.date.accessioned2021-01-29T23:06:22Z
dc.date.available2021-01-29T23:06:22Z
dc.date.issued2020
dc.description.abstractBecause of its high surface area and combination of various functional groups, graphene oxide (GO) is currently one of the most actively studied materials for electroanalytical applications. It is not practical to utilize self-supported GO on its own and thus it is commonly integrated with different supporting carriers. Having a large lateral size, GO can only wrap the particles of the support and thus can significantly reduce the surface area of porous materials. To achieve synergy from the high surface area and polyfunctional nature of GO, and the rigid structure of a porous support, the lateral size of GO must essentially be decreased. Recently reported graphene oxide quantum dots (GOQDs) can fulfil this task. Here we report the successful preparation of an SiO2-GOQDs hybrid, where GOQDs have been incorporated into the mesoporous network of silica. The SiO2-GOQDs emit a strong luminescence with a band maximum at 404 nm. The Raman spectrum of SiO2-GOQDs shows two distinct peaks at 1585 cm1 (G-peak) and 1372 cm1 (D-peak), indicating the presence of a graphene ordered basal plane with aromatic sp2-domains and a disordered oxygen-containing structure. Covalent immobilization of GOQDs onto aminosilica via such randomly structured oxygen fragments was proven with the help of Fourier transform infrared spectroscopy, solid-state cross-polarization magic angle spinning 13C nuclear magnetic resonance, and X-ray photoelectron spectroscopy. SiO2-GOQDs were used as a modifier of a carbon paste electrode for differential pulse voltammetry determination of two antibiotics (sulfamethoxazole and trimethoprim) and two endocrine disruptors (diethylstilbestrol (DES) and estriol (EST)). The modified electrodes demonstrated a significant signal enhancement for EST (370%) and DES (760%), which was explained by a p–p stacking interaction between GOQDs and the aromatic system of the analytes.en_US
dc.identifier.citationGraphene oxide quantum dots immobilized on mesoporous silica: Preparation, characterization and electroanalytical application [electronic resource] / Mikhraliieva A., Zaitsev V., Tkachenko O., Nazarkovsky M., Xing Y., Benvenutti E. V. // RSC Advances. - 2020. - Vol. 10, Issue 52. - P. 31305-31315.en_US
dc.identifier.urihttps://doi.org/10.1039/d0ra04605a
dc.identifier.urihttps://ekmair.ukma.edu.ua/handle/123456789/19360
dc.language.isoenuk_UA
dc.relation.sourceRSC Advances.en_US
dc.statusfirst publisheduk_UA
dc.subjectmesoporous silicaen_US
dc.subjectfunctional groupsen_US
dc.subjectgraphene oxideen_US
dc.subjectarticleen_US
dc.titleGraphene oxide quantum dots immobilized on mesoporous silica: Preparation, characterization and electroanalytical applicationen_US
dc.typeArticleuk_UA
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