Graphene oxide and electropolymerized p-aminobenzenesulfonic acid mixed film used as dopamine and serotonin electrochemical sensor

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 μmol dm −3 and 0.6–20 μmol dm −3 , the dopamine and serotonin concentration are linearly related to current intensity, and the detection limit is 0.09 μmol dm −3 and 0.2 μmol 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