▎ 摘　　要

In this paper, a thiol graphene-thiol chitosangold nanoparticles (thGP-thCTS-AuNPs) nanocomposites film with porous structure was fabricated by electrochemically depositing on glassy carbon electrode (GCE), which exhibited good biocompatibility and improved conductivity, to construct immunosensor free label for detection of carcinoembryonic antigen (CEA). The electrochemical behavior of this immunosensor was investigated by cyclic voltammetry. Under the optimum conditions, the immunosensor revealed a good amperometric response to CEA in two linear ranges (0.3-8.0 ng mL(-1) and 8.0-100 ng mL(-1)) with a detection limit of 0.03 ng mL(-1). The results indicated that the immunosensor has the advantages of good selectivity, high sensitivity, and good stability for the determination of CEA.