▎ 摘　　要

In this paper, a cheap, stable, and sensitive chitosan-N-doped graphene oxide (N-RGO) ion-imprinted sensor (IIPCd) was studied. The copolymer was deposited on the surface of the glassy carbon electrode (GCE) by the onestep deposition method, and IIP-Cd was obtained after eluted the target ions. XRD, FT-IR, SEM, and EDS were used to characterize the structure and morphology of different materials. The electrochemical properties of IIPCd were evaluated by cyclic voltammetry, electrochemical impedance spectroscopy, and differential pulse voltammetry. The linear range of the sensor was 0.01-0.1 mu M, and the detection limit was 3.51 nM (S/N = 3), and the sensor has high sensitivity, good reproducibility, and well stability. Besides, IIP-Cd still has high selectivity for Cd (II) in mixed ion solution (Zn(II), Hg(II), Cu(II), Cd(II), Mn(II), Ni(III)). The target ion cavity formed in IIPCd and the N-RGO as the substrate improves the electron transmission rate of the electrochemical sensor, thus realizing the green, environment-friendly, efficient and sensitive detection with low-cost raw materials in practical application.