Electroanalysis of Dopamine Using Reduced Graphene Oxide-Palladium Nanocomposites

Abstract

A novel polydopamine functionalized reduced graphene oxide/palladium (PDA-RGO/Pd) nanocomposite modified electrode was fabricated, and applied for the electrochemical determination of dopamine. The surface modification of GO sheets with PDA via a self-polymerization process and the formation of PDA-RGO/Pd composites were confirmed by UV-Vis spectroscopy, FTIR and SEM. The electrocatalytic activity of PDA-RGO/Pd to the oxidation of dopamine was evaluated using cyclic voltammetry and linear sweep voltammetry. The results showed that the anodic peak currents of DA were linearly proportional to its concentration in the range of 0.05 to 1 mM with a detection limit of 6.2 mu M (S/N = 3). In addition, the proposed sensor exhibited excellent anti-interference property.