▎ 摘　　要

A novel composite consisting of poly[iron (II) tetraphenylporphyrin] (PFeTPP) and poly(sodium-p-styrenesulfonate) (PSS) modified graphene (Gr), denoted as PFeTPP/PSS-Gr, was obtained by a solvothermal method and used for the voltammetric determination of dopamine (DA). Compared with either pristine PFeTPP or PSS-Gr, the fabricated composite exhibits superior electrocatalytic activity towards the oxidation of DA. Its oxidation peak current shows a linear dependence over the DA concentration in the range from 0.1 to 40 mu M, with a detection limit of 5.73 nM (S/N = 3). Furthermore, the fabricated PFeTPP/PSS-Gr composite can detect DA in the presence of a large excess of ascorbic acid (AA) and uric acid (UA). Our proposed sensor conceivably represents a promising material for bioanalytical applications. (C) 2015 Elsevier B.V. All rights reserved.