Fabrication of graphene-gold nanocomposites by electrochemical co-reduction and their electrocatalytic activity toward 4-nitrophenol oxidation

► A novel graphene-gold nanocomposite film modified GCE has been fabricated. ► The oxidation signal of 4-nitrophenol was remarkably improved at the modified GCE. ► This sensitive sensor has nearly wide dynamic range and low LOD.