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Because of high surface area and combination of various functional groups,graphene oxide (GO) is currently one of the most actively studying materialsfor electroanalytical applications. Self-supported GO is not practical enoughto be utilized individually and thus is commonly integrated with differentsupporting carriers. Having large lateral size GO can only wrap the particlesof the support and thus, can significantly reduce the surface area of porousmaterials. To reach synergy form high surface area and polyfunctional nature ofGO, and a rigid structure of porous support, the lateral size of GO must beessentially decreased. Recently reported graphene oxide quantum dots (GOQDs)can fulfill this task. We report successful preparation of mesoporous silicasupported GOQDs exhibiting strong luminescent band with the maximum at 404 nm.From N2 adsorption isotherms, it was demonstrated that the surface area of theresulted hybrid material was augmented. Raman spectrum of SiO2-GOQDs shows twodistinct peaks at 1585 cm-1(G-peak) and 1372 cm-1 (D-peak) indicating presenceordered basal plane of graphene with aromatic sp2 domains, and disorderedoxygen-containing structure. Covalent immobilization of GOQDs on aminosilicavia such oxygen-containing fragments was proved by FTIR, MAS 13C MNR, and XPSspectroscopy. SiO2-GOQDs was used as a modifier of carbon paste electrode fordifferential pulse voltammetry determination of four environmental:sulfamethoxazole, trimethoprim, diethylstilbestrol (DES), and estriol (EST).The modified electrodes demonstrated an essential decrease in LOD for EST(220%) and DES (760%), which was explained by significant pi-pi stackinginteraction between GOQDs and aromatic system of the analytes.

Chemical-Grafting of Graphene Oxide Quantum Dots for Enhanced Electrochemical Analysis of Aromatics