Preparação do nanocompósito entre óxido de grafeno e azul da prússia e aplicação na detecção de glicerol

Abstract

In this work, thin films of a nanocomposite between graphene oxide (GO) and Prussian blue (PB) were synthesized using the interfacial method, with subsequent characterization and evaluation of its performance for the detection of glycerol. The synthesis was carried out through the interfacial method using the AP precursors in the aqueous phase and a dispersion of the carbon material in organic solvent. The nanocomposite films were characterized by different techniques, such as Raman spectroscopy, scanning electron microscopy, dispersive energy X-ray spectroscopy, infrared spectroscopy and UV-Vis spectroscopy. All the characterization methods proved the success in the synthesis of the materials of interest, as well as a strong interaction between the individual components. The presence of the carbonaceous material provided less agglomeration of the PB nanoparticles, as well as the formation of a large amount of Prussian blue at the water/toluene interface. Moreover, the electrochemical study of the films by cyclic voltammetry was carried out, which show an excellent stability. Square-wave voltammetry was used for the determination of glycerol using the films as the working electrode, obtaining good analytical parameters, such as linearity (R> 0.99), linear range from 60 to 140 μmol L-1, a sensitivity of 0.3051 A L mol-1 and a limit of detection of 19 μmol L-1, results that are promising in comparison to other studies in the literature for the application of the material as glycerol sensor.