▎ 摘　　要

By using zinc nitrate as precursor and hydrazine hydrate as reducing agent, polydiallyl dimethyl ammonium chloride modified reduced graphene oxide/zinc oxide composite materials (PDDA-rGO/ZnO) were prepared by simultaneous reduction of graphene oxide (GO) and zinc nitrate. The composite materials were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffractometer (XRD) and transmission electron microscopy (TEM), and their electrochemical catalytic activity for uric acid was studied by cyclic voltammetry (CV) and linear sweep voltammetry (LSV) measurements. The result showed that PDDA-rGO/ZnO modified glassy carbon electrode prepared here was sensitive, reproducible and stable, and had significant electrocatalytic activity for UA. When using linear sweep voltammetry for detection of UA, the responses of modified electrode were linear with UA concentration in the ranges of 0. 02-0.1 mmol/L and 0. 1-1.0 mmol/L respectively, with detection limit of 15.9 nmol/L (S/N = 3).