Electrochemical deposition of high density gold nanoparticles on indium/tin oxide electrode for fabrication of superoxide anion biosensor

Abstract

High density gold nanoparticles (GNPs) on indium tin oxide (ITO) film coated glass have been prepared by electrochemical deposition from KAu(CN)2 solution. In this study, suitable applied potential ranges and deposition cycles are chosen to achieve high density GNPs on ITO surface. The potential utility of the high density GNP/ITO substrate are investigated. The superoxide dismutase (SOD) was immobilized on this substrate to fabricate a superoxide anion biosensor. The biosensor exhibits a rapid and high response to superoxide anion.