A carbon nanotube-based electrochemical immunosensor for cardiac troponin T

► A carbon nanotube (CNT) electrode for cardiac Troponin T (cTnT) detection was developed. ► Polyethyleneimine film was used to anchor carboxylated CNT in which anti-cTnT was immobilized. ► It was achieved a low detection limit (0.033 ng mL− 1) without necessity of chemical mediators.