▎ 摘　　要

An electrochemical sensor based on palladium-copper nanoparticles/three-dimensional reduced graphene oxide ([PdCu/3DRGO]) was constructed for detection of a p-nitrophenol (4-NP) with wide detection range and high stability. [PdCu/3DRGO] were synthesized by hydrothermal method using a solution containing palladium ions, copper ions and graphene oxide, which were characterized by scanning electron microscope (SEM), X-ray diffration (XRD), energy dispersive spectroscopy (EDS) and Fourier transform infrared spectroscopy (FT-IR). As-made composite was dropped on the surface of glassy carbon electrode to make the modified electrode ([PdCu/3DRGO]/GCE), of which electrochemical behavior was characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Under the optimized experimental conditions, the modified electrode was used to detect 4-NP using differential pulse voltammetry (DPV) and current-time curve (i-t). The limit of detection was 0.050 mu mol/L(S/N = 3), the sensitivity was 0.372 mu A/(mu mol/L cm(2)), and the linear range was 10-3000 mu mol/L. The sensor represented good stability and strong anti-interference performance which the common inorganic ions and structural analogues in water did not interfere with the determination of 4-NP.