Localized surface plasmon-induced vibrational excitations in the surface-enhanced Raman scattering using two-dimensional array of silver nanocubes

Satoshi Katano, Takeru Iwahori, Ryota Yamasaki, Ayana Mizuno, Atsushi Ono, Yoichi Uehara

Research output: Contribution to journalArticlepeer-review

Abstract

We have investigated the nanoscale structural and vibrational properties of polyvinylpyrrolidone (PVP)-covered silver nanocubes (AgNCs) array. The ordered AgNCs array fabricated on Au(111) by the Langmuir-Blodgett method was utilized for a surface-enhanced Raman scattering (SERS) platform. The local arrangements and the facet structure of AgNCs were observed by various types of microscopies, which revealed that AgNCs form an ordered monolayer and exhibit an atomically flat facet. The vibrational peaks associated with PVP were clearly observed in the Raman spectra owing to the SERS effect by AgNCs. We found that two types of C=O stretching peaks appear in the Raman spectra, of which the appearance patterns depend on the excitation energy of the incident laser. The simulations based on the finite-difference time domain method imply that highly ordered 2D AgNCs enable us to excite localized surface plasmon modes, such as a single particle mode and a gap mode, of AgNCs selectively, leading to vibrational excitation of PVP existed at the surface and the gap of AgNCs.

Original languageEnglish
Article number185301
JournalJournal of Applied Physics
Volume127
Issue number18
DOIs
Publication statusPublished - 2020 May 14

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Localized surface plasmon-induced vibrational excitations in the surface-enhanced Raman scattering using two-dimensional array of silver nanocubes'. Together they form a unique fingerprint.

Cite this