▎ 摘　　要

A graphene quantum dots (GQDs) modified glassy carbon electrode (GCE), namely GQDs/GCE was prepared by electrodeposition method, which was characterized by chronocoulometry and electrochemical impedance spectra. The electrochemical behavior of the prepared modified electrode towards the catalytic oxidation of dopamine (DA) in pH 7.0 phosphate buffer solution was investigated by cyclic voltammetry and differential pulse voltammetry. It was demonstrated that the modified electrode presented good electrocatalytic activity and had favorable electrochemical response towards DA without the interference of ascorbic acid. The probable mechanism on the modified electrode surface was proposed. Under optimum conditions, the dependence of current vs. concentration was linear from 0.4 to 100 mu M with a regression coefficient of 0.997, and the detection limit of DA was 50 nM (S/N=3). Analytical application of GQDs/GCE was successfully tested in the determination of DA in real samples.