▎ 摘　　要

The graphite oxide (GO) was synthesized by a modified Hummers method, and with adding a certain amount of PEI-Ag+ and using sodium borohydride as reducer, graphene/silver nanocomposites were prepared by a self-assembly method. The UV-visible spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), cyclic voltammeter, scanning electronic microscope (SEM) and Raman spectroscopy were used to characterize graphene/silver nanocomposites. The antibacterial efficiency of graphene/silver nanocomposites was tested against E.coli and S.aureus. The results show that silver nanoparticles are distributed over the graphene sheet between layers. The graphene/silver nanocomposites have good and steady antimicrobial property against S.aureus and E.coli. When the concentrations of grapheme/Ag are 4 and 15 mg/mL, the antimicrobial property against S.aureus and E.coli is better, respectively.