▎ 摘　　要

In this work, we developed a highly selective detection of chloramphenicol (CAP) using palladium nanoparticles decorated graphene oxide (rGO/PdNPs) nanocomposite. Moreover, the successful formation of rGO/PdNPs nanocomposite was verified by TEM, UV-Vis, FT-IR spectra, X-ray photoelectron spectroscopy (XPS). The electrochemical characteristics of the electrochemical sensor were evaluated by differential pulse voltammetry (DPV) and cyclic voltammetry (CV). Furthermore, the rGO/PdNPs modified GCE displayed an excellent electroactivity in the presence of chloramphenicol as compared to that of modified and unmodified glassy carbon electrode (GCE). It showed an excellent performance with a linear response range of 50-1000 nM and the low detection limit of 50 nM (S/N = 3). In addition, the present promising sensor exhibited high sensitivity, good stability as well as remarkable reproducibility, and satisfactory recovery rate for CAP electrochemical detection in real samples.