講演情報
[17p-M_123-9]Development of an Electrochemical–Surface Plasmon Resonance Platform for In situ Analysis of Doping States in PEDOT:PSS/AuNP Glucose Sensors
〇(D)Charin Seesomdee1, Sachiko Jonai1, Kazunari Shinbo1, Akira Baba1 (1.Niigata Univ.)
キーワード：
surface plasmon resonance、electrochemical、glucose sensors
Photoelectrochemical (PEC) systems have attracted considerable attention due to their ability to convert light energy into electrical signals, enabling applications in solar energy conversion, environmental monitoring, and biosensing. The performance of PEC devices is strongly governed by interfacial charge transfer processes between photoactive materials and electrodes. Therefore, the real-time investigation and control of these interfacial phenomena are essential for improving device functionality and sensing reliability.Surface plasmon resonance (SPR) is a powerful, label-free optical technique for probing interfacial processes with high temporal resolution [1, 2]. In particular, electrochemical–surface plasmon resonance (EC–SPR) integrates electrochemical control with optical monitoring, enabling direct investigation of the correlation between redox reactions and plasmonic responses at electrode interfaces. In this study, we focus on glucose photoelectrochemical sensing using PEDOT:PSS/gold nanoparticles (AuNP) thin films and aim to clarify how glucose-induced electrochemical reactions modify the dielectric properties and doping state of PEDOT:PSS through interfacial electron transfer. By employing the EC–SPR technique, these changes are evaluated in situ via SPR signal variations during electrochemical glucose sensing. However, conventional EC–SPR configurations are typically limited to purely electrochemical systems and are not readily adaptable to studies of photoinduced charge transfer. To overcome this constraint, we developed an EC–SPR platform using a grating-structured gold (Au) electrode as the plasmonic substrate (Fig. 1). This platform enables real-time observation of dielectric and electronic-state changes in PEDOT:PSS–AuNP films during glucose sensing reactions, thereby providing a foundation for future PEC–EC–SPR integration.