▎ 摘　　要

The present work reports a facile and direct electrochemical method for sensing of trace Cu2+ by employing amino-functionalized graphene (NH2-G) and chitosan (Cs) as enhanced sensing platform. Amino-functionalized graphene was prepared by using a simple and effective solvothermal method and characterized by Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). The novel amino-functionalized graphene/chitosan (NH2-G/Cs) composite was facilely prepared by sonochemical method. After being characterized with cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), some relevant parameters influencing the sensor response were investigated and optimized. Analytical performance of the NH2-G/Cs modified glassy carbon electrode for the determination of Cu2+ was evaluated by differential pulse voltammetry (DPV). Under optimized operating conditions, the sensor linearly responded to Cu2+ concentration in the range from 0.4 to 40 mu mol/L with a detection limit of 0.064 mu mol/L (S/N = 3). Most importantly, the NH2-G/Cs/GCE achieved high selectivity and sensitivity for the analysis of trace Cu2+ in water samples.