Electrochemical Characterization of InN Thin Films for Biosensing Applications

InN, a well-established optoelectronic material, is currently being considered as a promising material for sensor applications. In this study, the fundamental electrochemical properties of InN thin film and its potential for electrode chemical and bio-sensing applications are demonstrated. The cyclic voltammograms of different concentrations of dopamine solution in 1 M HClO4 were measured. Similarly, potentiostatic measurements at.1 V versus Ag/AgCl show stable responses and linear change of current density with concentrations up to 0.475 mM dopamine. The InN thin film also demonstrated repeatable positive photoresponse to, cathodic currents in 1 mM Ru(NH3)(6)(3+) in 1M KCl solution under a 100 mW cm(-2) 808-nm laser light illumination at a constant -0.25 V (vs. Ag/AgCl) bias The cathodic current response showed a 27% enhancement, demonstrating its potential as photocathode. This cathodic photocurrent behavior is explained through the electron accumulation of the InN material.