Síntese eletroquímica de nanocompósitos do tipo hexacianoferrato de prata/óxido de grafeno reduzido visando à aplicação em sensores

Abstract

In this work, reduced graphene oxide (rGO) modified with silver hexacyanoferrate (AgHCF) thin films were synthetized on a glassy carbon electrode (GCE) and posterior performance evaluation compared to paracetamol (PA) evaluation. The synthesis was executed by electroreduction of a graphene oxide aqueous dispersion containing AgNO3 in Na2HPO4. After, the electrode was electrochemically cycled in potassium hexacyanoferrate (1.0 mmol L-1) with K2SO4 0.1 mol L-1 as a support electrolyte. The different films were characterized through electrochemical techniques as scanning speed and pH effect tests. And also other techniques as scanning electron microscopy, energy dispersive spectroscopy and Raman spectroscopy. The application in the detection of the paracetamol drug was successfully executed, obtaining sensibility of 0.0164 μA μmol L-1, detection limit of 2.38 μmol L-1 and quantification limit of 7.16 μmol L-1.