Au nanoparticles decorated reduced graphene oxide for the fabrication of disposable nonenzymatic hydrogen peroxide sensor

A simple approach is followed for the fabricaticin of disposable nonenzymatic hydrogen peroxide (H2O2) sensor using gold nanoparticles decorated reduced graphene oxide (Au/rGO) nanocomposite. Au/rGO nanocomposite was prepared by one pot reduction of graphene oxide and Au(III) ions. The composite was characterized using various spectroscopic and microscopic techniques. The Au/rGO nanocomposite suspension was cast on the indigenously fabricated screen printed electrode (SPE). Voltammetric studies on the modified electrode showed that the Au/rGO nanocomposite modified SPE have enhanced catalytic activity towards H2O2. The sensor exhibited linear relationship in the range from 20 mu M to 10 mM with a sensitivity of 1238 mu A mM(-1) cm(-2) and a limit of detection 0.1 mu M. The sensor also showed excellent selectivity in presence of other electroactive species such as ascorbic acid, dopamine, glucose and uric acid. (C) 2016 Elsevier B.V. All rights reserved.