Graphene-supported poly[iron (II) tetraphenylporphyrin] hybrid fabricated by a solvothermally assisted π–π assembly method and its application for the detection of dopamine

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   μM, 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.