Graphene-Pt nanocomposite for nonenzymatic detection of hydrogen peroxide with enhanced sensitivity

A sensitive hydrogen peroxide (H(2)O(2)) sensor was fabricated based on graphene-Pt (GN-Pt) nanocomposite. The GN-Pt was synthesized by photochemical reduction of K(2)PtCl(4) on GNs, and characterized by atomic force microscope (AFM), transmission electron microscope (TEM), and energy-dispersive X-ray spectroscopy (EDS). Electrochemical investigations indicated that the GN-Pt exhibited a high peak current and low overpotential towards the reduction of H(2)O(2). The GN-Pt modified glass carbon electrode displayed a wide linear range (2-710 mu M), low limit of detection (0.5 mu M) and good selectivity for detection of H(2)O(2) with a much higher sensitivity than that of Pt nanoparticles or graphene modified electrode. (C) 2011 Elsevier B.V. All rights reserved.