COOH+ ion implantation-modified indium tin oxide electrode for the direct electrochemistry of cytochrome c

A COOH+ ion implantation-modified indium tin oxide (COOH/ITO) electrode was prepared and the existence of carboxyl group on the electrode was verified by X-ray photoelectron spectroscopy analysis. The field emission-scanning electron microscope result showed that the ion implantation formed many active centers on the ITO surface. The COOH/ITO electrode was applied for cytochrome c (cyt c) immobilization and the electrochemical behaviors of cyt c were evaluated by cyclic voltammetric techniques. The results demonstrated that the immobilized cyt c retained its electrocatalytic activity to the reduction of H2O2. This ion implantation-modified electrode might be used in development of new biosensors and biofuel cells.