SYNTHESIS AND CHARACTERISATION OF GRAPHENE OXIDE AND ITS NANOCOMPOSITE FOR BIOSENSING APPLICATIONS

Abstract

Graphene Oxide (GO) and Titanium dioxide (TiO2) nanocomposites have been synthesized by chemical oxidation meathod. The materials were characterized using Fourier transform infrared spectroscopy, powder X-ray diffraction, scanning electron microscopy, differential scanning calorimetry. The synthesized GO-TiO2 nanocomposites were used to prepare film onto indium tin oxide coated glass substrate by electrophoretic deposition at different potentials. The cyclic voltammetry analysis of the film are conducted at different scan rates (10 to 300 mVs-1) shows that the anodic peak current increases as the scan rate is increased. Through CV studies we observed that there is an increase in value of average surface coverage and diffusion coefficient in case of GO-TiO2 /ITO electrode film as compared to GO/ITO electrode. The electrochemical sensing studies of hydrogen peroxide (H2O2) shows increase in anodic peak current with increase in H2O2 concentration(50 to 200 M) in PBS (pH 7.4) containing 5 mM [Fe(CN)6]3-/4-.