将金纳米粒子(Au NPs)负载到氮掺杂石墨烯(N-G)的表面,用来修饰玻碳电极(GCE);以亚甲基蓝(MB)为指示剂,将探针DNA连接在电极表面,成功构建了DNA传感器.通过交流阻抗曲线(EIS)和差分脉冲曲线(DPV)的变化探讨了该传感器的选择性,重复性.得到了该电化学传感器的检测限为1.034×10-9 mol/L.“,”The gold nanoparticles ( Au NPs) were loaded onto the surface of nitrogen-doped graphene ( N-G) to modify the glassy carbon electrode ( GCE);besides, the probe DNA was immobilized on the surface of the electrode with methylene blue ( MB) as an indicator, and then the DNA biosensor is successfully constructed. The selectivity and repeatability of the sensor are discussed by the changes of EIS and DPV. The detection limit of the electrochemical sensor was 1. 034 × 10 -9 mol/L