Application of commercial poly(3,4-ethylenedioxy-thiophene):poly(styrene sulfonate) for electrochemical sensing of dopamine

Abstract

In this paper, a simple and stable composite electrode based on intrinsically conducting polymer poly(3,4-ethylenedioxythiophene):poly(sty-renesulfonate) (PEDOT:PSS) and ion-exchange polymer Nafion, was successfully fabricated by drop-coating the blended commercially available PEDOT:PSS aqueous dispersion and Nafion solution on the surface of glassy carbon electrode (GCE). PEDOT:PSS was used as a matrix, while Nafion was employed to improve the immobilization stability of composite films and adhesion to electrode surface in comparison with PEDOT:PSS films. Cyclic voltammetry, differential pulse voltammetry, electrochemical impedance spectroscopy, and scanning electron microscopy were utilized to characterize the properties of this composite electrode. The as-proposed composite electrode displayed good water-stability. Meanwhile, the composite electrode was applied to electrochemical sensing of dopamine, and the performance of PEDOT:PSS-Nafion composite films was evaluated. These results demonstrate that PEDOT:PSS-Nafion composites are a promising candidate of electrode modified material in electrochemical sensing and other electrocatalytic applications.

Keywords

• PEDOT:PSS
• nafion
• electrocatalysis
• dopamine
• electrochemical sensor