▎ 摘　　要

A novel electrochemical sensor is prepared by electropolymerization with p-aminobenzenesulfonic acid (p-ABSA) film and dropping graphene oxide on the surface of electrode. The results indicated that GO-poly(p-ABSA) nanofilms displayed enhanced current responses to dopamine and serotonin. In the range of 0.3-20 mu mol dm(-3) and 0.6-20 mu mol dm(-3), the dopamine and serotonin concentration are linearly related to current intensity, and the detection limit is 0.09 mu mol dm(-3) and 0.2 mu mol dm(-3) (S/N = 3), respectively. By adding dopamine and serotonin standards, the electrochemical sensor is applied in serum sample. The results show that the GO-poly(p-ABSA) films represent well-modified materials for use in the biosensors. Graphic abstract [GRAPHICS]