▎ 摘　　要

A novel sensor was developed based on the electrostatic layer-by-layer (LBL) self-assembly technique on a glassy carbon electrode (GCE) modified with nitrogen-doped graphene (NG) and polyethylenimine (PEI). Electrochemical studies exhibit that the assembled NG multilayer films have favorable electron transfer ability and electrocatalytic property, which could enhance the response signal towards dopamine (DA) in the presence of ascorbic acid (AA). In addition, the self-assembly electrode possess an excellent sensing performance for the detection of dopamine with a linear range from 1.0 x 10(-6) M to 1.3 x10(-4) M, and the detection limit is 5 x 10(-7) M (S/N=3).