Electrochemical Determination of Dopamine at Nanoparticles Modified Polymer Electrode—A Brief Study

A simple nanosensing film is deposited electrochemically using cyclic voltammetry technique. In this regard, two kinds of film were made viz. Au-Pt deposited on polyaniline and Au-Cu deposited on polyaniline matrix. The film surface of the modified electrode was characterized by SEM and the results indicated that the particles were dispersed uniformly on the conductive polymer matrix in nanometer size regime. Such films deposited on GC electrode are utilized for the efficient electrocatalytic oxidation of neurotransmitter viz. dopamine in the presence of interfering species. The experimental results suggest that the composite film modified electrode combining the advantages of polyaniline and metal nanoparticles exhibits dramatic electrocatalytic effect on the oxidation of dopamine (DA) and results in a marked enhancement of the current response. Such nanomaterials modified electrodes could be used as a biosensor with high selectivity, sensitivity and detection of submicromolar concentrations of dopamine with practical applications to real samples.