A feasible and practicable electrochemical impedance immunosensor strategy was established for detection of carcinoembryonic antigen based on platinum nanoparticles assembled on functional single-walled carbon nanotubes-chitosan composites( SWCNTs-CS) through potentiostatic deposition method,designed as Pt NPs-SWCNTs-CS composites. Pt NPs and functional SWCNTs-COOH combined with carcinoembryonic antigen antibody( CEA) through covalent bond to form anti-CEA-Pt NPs-SWCNTs-CS / GCE. Under the existence of CEA,...