▎ 摘　　要

We developed a novel Ag nanoparticles (NPs) supported on N-doped graphene (AgNPs/N-G) hybrid material that was used as an electrochemical sensor for H2O2 detection. AgNPs/N-G was synthesized by an environmentally friendly strategy with urea as the N-dopant and vitamin C as the reducing agent. Electrochemical measurements revealed a lower electrical resistance and higher electrocatalytic activity of AgNPs/N-G than undoped counterparts (AgNPs/reduced graphene oxide (rGO)). The AgNPs/N-G based sensor exhibited a fast response time (<2 s), a wide linear range (0.1-126.4 mM) and a low detection limit (1.2 mu M). Moreover, the proposed sensor exhibited satisfying selectivity, reproducibility, and stability. These results indicated that AgNPs/N-G modified electrode could act as a promising nonenzymatic sensor for H202 detection. (C) 2014 Elsevier Ltd. All rights reserved.