Presentation Information
[10p-E201-11]Optical Properties of SIGN Structure with SERS-Active Molecular Spacer
〇ZHENGQI HU1, Maria Vanessa Balois Oguchi1, Kotaro Kajikawa1 (1.Science Tokyo)
Keywords:
Surface-enhanced Raman scattering
The surface-immobilized gold nanoparticle (SIGN) structure forms reproducible hot spots in the gap between the nanoparticle and the metal substrate, enabling strong SERS enhancement. In this study, SIGN structures were fabricated by immobilizing 80 nm gold nanoparticles onto a 50 nm gold film via an ABT self-assembled monolayer (SAM), with surface coverage controlled by varying the nanoparticle solution concentration. Reflection absorption spectra and SERS spectra were measured under p-polarized oblique incidence at 60°. With increasing coverage, Band A (≈520 nm) increased in intensity, while Band B (≈700 nm) showed a blueshift and its intensity did not increase monotonically. Strong SERS signals attributed to ABT were also observed from the fabricated SIGN structures. These results demonstrate that nanoparticle surface coverage serves as a parameter for tuning both the resonance wavelength and peak intensity of the gap-mode band.