▎ 摘　　要

A highly efficient electrochemical sensor consisted by gold nanoparticles (Au NPs) loaded on reduced graphene oxide (RGO) nanosheets for Cu2+ and Hg2+ was developed. The electrochemical performances of as-prepared bare glassy carbon electrode (GCE), RGO/GCE, Au NPs@RGO/GCE were characterized by cyclic voltammetry (CV) and differential pulse voltammetry (DPV), respectively. The Au NPs@RGO/GCE exhibited an excellent sensitivity toward Cu2+ and Hg2+. The results revealed that the detection limit of Cu2+ was 0.0015 mu M and Hg2+ was 0.02 mu M (S/N = 3). In addition, the Au NPs@RGO nanocomposite modified electrode was optimized and applied for practical water sample analysis with a satisfactory outcome. The electrochemical sensor based on Au NPs@RGO would be expected to expand the application field of heavy metal detection.