[17a-WL2_201-1~11] 3.11 Nanoscale optical science and near-field optics

11:00 AM - 11:15 AM JST(2:00 AM - 2:15 AM UTC)

[17a-WL2_201-8] In situ observation of molecular adsorption processes in liquid using SERS

〇Maria OGUCHI¹, Shoma SUZUKI¹, Kotaro KAJIKAWA¹ (1.Science Tokyo)

Keywords:

SERS,plasmonics,adsorption

Surface-enhanced Raman spectroscopy (SERS) enables sensitive detection of molecules adsorbed on nanostructured metal surfaces and is a promising tool for probing interfacial phenomena. In this study, we demonstrate in situ observation of molecular adsorption processes in liquid using a SERS substrate based on surface-immobilized gold nanoparticles (SIGN). Time-dependent SERS measurements were performed for crystal violet in a liquid environment. The Raman intensity increased and stabilized after analyte introduction, indicating adsorption onto the gold nanoparticle surface. Concentration-dependent signal changes and signal reduction upon ethanol injection were also observed, reflecting adsorption and desorption processes. These results highlight the potential of SIGN-based SERS substrates for real-time monitoring of molecular adsorption behavior in liquid environments.