▎ 摘　　要

Based on the reduction and interlinkage of the amino acid cysteine (Cys), graphene, gold nanoparticles (AuNPs) and the redox enzyme horseradish peroxide (HRP) were combined to form an integrated hybrid systems(HRP/AuNP-Cys-graphene) on a glassy carbon (GC) electrode. Its structure and composition were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectroscopy. Using ultraviolet-visible (UV-vis) spectroscopy, the step-wised synthesis process of AuNP-Cys-graphene was monitored. Because of the biocompability and conductivity of the hybrid, the as-fabricated HRP/AuNP-Cys-graphene/GC electrode not only exhibited enhanced direct electrochemistry of HRP, but also showed better electrochemical performance for the detection of hydrogen peroxide, such as a broader range of linear response and good stability.