Facile Synthesis of Graphene-poly(styrene sulfonate)-Pt Nanocomposite and Its Application in Amperometric Determination of Dopamine

Graphene-poly(styrene sulfonate)-Pt nanocomposite (GN-PSS-Pt) was synthesized with the mixture of graphene oxide and chloroplatinic acid by microwave treatment. The nanocomposite was characterized by Transmission electron microscopy (TEM), X-ray diffraction (XRD), and Raman spectroscopy, respectively. The electrochemical behaviour of dopamine on the nanocomposite was investigated. A chronoamperometry method was developed for the determination of dopamine. The corresponding linear range was in 2.0 × 10−7–4.0 × 10−3 M and the detection limit was estimated as 4.0 × 10−8 M (S/N = 3). Moreover, the modified electrode was applied to the determination of dopamine in human urine and serum samples.