A highly efficient electrochemical sensor consisted by gold nanoparticles (Au NPs)loaded on reduced graphene oxide (RGO) nanosheets for Cu 2+ and Hg 2+ 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 Cu 2+ and Hg 2+ . The results revealed that the detection

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... t of Cu 2+ was 0.0015 μM and Hg 2+ was 0.02 μM (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.