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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)63+ 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.
biosensor, potentiostatic measurements, dopamine detection, biocompatibility, photoresponse
This research was supported by the Taiwan International Graduate Program of Academia Sinica, National Science Council, Ministry of Education in Taiwan, and US AFOSR-AOARD.
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