Electrochemical fabrication of Polyaniline-Graphene Quantum films containing gold nanoparticles deposited on titanium electrode for electro-oxidation of ascorbic acid

Polyaniline-Graphene Quantum Dot/gold (Au/PANI-GQD) films were prepared by tow step electrochemical process. At the first step, mixture of aniline and GQD was heated and refluxed then electopolymrization performed. At the second step gold’s nanoparticles were dispersed on the surface of PANI-GQD film from galvanostatic condition in the bath containing KAu(CN)2. The electrochemical behavior and electro-catalytic activity of Au/PANI-GQD electrode were characterized by cyclic voltammetry. The morphology of the PANI-GQD film and gold coating on this electrode were characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) respectively. Results indicated that gold nanoparticles were homogeneously dispersed on the surface of polyaniline film. The electro-oxidation of ascorbic acid is found to proceed more facile on Au/PANI-GQD electrode than on bare gold electrode. The irreversible oxidation current of ascorbic acid exhibits a linear dependence on the ascorbic acid concentration in the range of 1–5 mM.