Presentation Information
[10p-PA4-10]Development of an In Situ Electrochemical–Surface Plasmon Resonance Platform for Characterization of PEDOT:PSS/AuNP-Based Glucose Sensors
〇(D)Charin Seesomdee1, Sachiko Jonai1, Kazunari Shinbo1, Akira Baba1 (1.Niigata Univ.)
Keywords:
Surface plasmon resonance,Photoelectrochemical,Glucose sensors
This work develops an electrochemical–surface plasmon resonance (EC–SPR) platform for the in situ investigation of sensor interfacial phenomena during glucose sensing. For sensor applications, the EC–SPR platform can be combined with photoelectrochemical (PEC) systems, which integrate optical excitation and electrochemical processes, enabling sensitive detection of interfacial reactions in biosensing and environmental monitoring [1,2]. The EC–SPR platform enables real-time monitoring of electrochemical reactions and interfacial charge transfer, providing valuable insight into sensor behavior and performance while guiding the characterization and optimization of thin-film fabrication methods in PEC sensors. In this study, the sensor chip employs a grating-structured gold electrode as a plasmonic substrate, allowing simultaneous electrochemical control and optical monitoring. PEDOT:PSS/AuNP thin films are used as the sensing layer, and glucose-induced reactions are analyzed through combined electrochemical and SPR measurements, as shown in Fig. 1(a). As for the results, the EC-SPR platform shows SPR dip curves obtained after each fabrication step that confirm that the optical signal is sensitive to refractive index changes caused by thin-film deposition, as shown in Fig. 1(a). During glucose sensing, the electrochemical response reflects electron transfer associated with glucose oxidation, while the SPR signal reveals corresponding changes in the dielectric properties and doping state of the PEDOT:PSS layer, as shown in Fig. 1(b) and (c). The EC–SPR platform enables real-time monitoring of electrochemical reactions and interfacial changes, providing valuable insight into sensor behavior and performance while guiding the optimization of thin-film fabrication methods. The platform demonstrates potential for the real-time investigation of electrochemical interfaces and plasmon-enhanced sensing systems.