▎ 摘　　要

Significantly enhanced catalytic activity of a nanocomposite composed of conducting polymer poly (3,4ethylenedioxythiophene) (PEDOT) doped with graphene oxide (GO) was achieved through a simple electrochemical reduction process. The nanocomposite (PEDOT/GO) was electrodeposited on an electrode and followed by electrochemical reduction, and the obtained reduced nanocomposite (PEDOT/RGO) modified electrode exhibited lowered electrochemical impedance and excellent electrocatalytic activity towards the oxidation of dopamine. Based on the excellent catalytic property of PEDOT/RGO, an electrochemical sensor capable of sensitive and selective detection of DA was developed. The fabricated sensor can detect DA in a wide linear range from 0.1 to 175 mu M, with a detection limit of 39 nM, and it is free from common interferences such as uric acid and ascorbic acid. (C) 2014 Elsevier B.V. All rights reserved.