Enzyme-Free Glucose Sensor Based on Star-Like Copper Particles-Polyaniline Composite Film

Abstract

This work reports on the preparation of an electrode material based on polyaniline (PAni) thin film, with an average thickness of 100 nm, containing copper (Cu) microparticles dispersed on its surface. The prepared electrode material was employed as a sensor for glucose determination in alkaline medium. A two-step electrochemical process was used to synthesize the Cu–PAni composite films: First, PAni layer was deposited on indium tin oxide (ITO) substrate from an organic solution of the aniline under potensiostaic conditions. Secondly, Cu particles were electrodeposited on PAni/ITO surface from a separate aqueous solution by chronoamperometry technique. The morphology analysis of the Cu–PAni composites shows that the copper particles are visible like stars uniformly dispersed over the polymer surface. XRD patterns shows that the PAni film is amorphous whereas copper is polycrystalline. Examined by cyclic voltammetry and chronoamperometry techniques, the response to glucose of the Cu–PAni/ITO electrode shows good performance in 0.1 M NaOH solution.