▎ 摘　　要

In the present work, graphene/gold nanoparticle (AuNP) composites were synthesized via a one-step and green method using modified epoxy resin E-44 (AB-EP-44)-a phenolic-as both stabilizer and reductant in aqueous solution. The as-prepared samples were further characterized by ultraviolet-visible (UV-Vis) absorption spectra, transmission electron microscopy (TEM) and x-ray photoelectron spectroscopy (XPS), proving the successful synthesis of graphene/AuNP composites, and that the small AuNPs with an average diameter of similar to 3 nm were uniformly dispersed on graphene sheets. The composites exhibited excellent electrochemical activity towards reduction of H2O2 with a good linear response from 0-130 mu M and a high sensitivity of 0.283 mu A mu M-1 cm(-2); in addition, a detection limit of similar to 0.45 mu M (the signal/noise: 3) was achieved by using a graphene/AuNP sensor. Furthermore, the graphene/AuNP composites showed highly catalytic activity toward 4-nitrophenol (4-NP) reduction. The present green and simple synthesis approach also could be used to prepare other metal/graphene nanomaterials.