Au-TiO2/Graphene Nanocomposite Film for Electrochemical Sensing of Hydrogen Peroxide and NADH

We describe a simple method for preparing Au-TiO 2 /graphene (GR) nanocomposite by deposition of Au nanoparticles (NPs) on TiO 2 /GR substrates. The as-prepared Au-TiO 2 /GR was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The presence of Au NPs on TiO 2 /GR surface remarkably improves the electrocatalytic activity towards the oxidation of hydrogen peroxide (H 2 O 2 ) and β -nicotinamide adenine dinucleotide (NADH). The Au-TiO 2 /GR modified glassy carbon (GC) electrode exhibits good amperometric response to H 2 O 2 and NADH, with linear range from 10 to 200 µM and 10 to 240 µM, and detection limit of 0.7 and 0.2 µM, respectively.