Electrochemical Surface Plasmon Resonance (SPR) Method; New Technique for Opto-Electrochemistry and Electrochemical Imaging

INTRODUCTION Various optical measurement techniques have been developed for the characterization of surface states during electrochemical processes. Surface plasmon resonance (SPR) spectroscopy has been used in combination with electrochemistry to investigate the electronic structure of metal-electrolyte interfaces [1]. We reported the current efficiency of refractive index changes that occurred during the monitoring of oxide film formation and ion adsorption on gold electrodes by simultaneous voltammetry and SPR measurements [2]. We also applied this system to measure the electrochemical reaction of methylene blue (MB) and ferrocyanide [3-4]. We also fabricated an SPR-based electrochemical biosensor based on the detection of the reversible refractive index change that occurs in redox mediator film [5]. Here, we report on electrochemical-SPR measurement for biosensor application and multi-channel detection realized by the SPR imaging of bioelectrochemical reactions.