Blocking Hot Electron Emission by SiO2 Coating Plasmonic Nanostructures

Nobuyuki Takeyasu, Kenzo Yamaguchi, Ryusuke Kagawa, Takashi Kaneta, Felix Benz, Masamitsu Fujii, Jeremy J. Baumberg

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Noble metallic nanostructures provide a platform for high-sensitivity spectroscopic sensing with significantly enhanced electromagnetic fields due to surface plasmon polaritons. However, target molecules can be transformed into other molecules under irradiation with an excitation laser during the surface-enhanced measurement, which thus disturbs detection of unknown samples. In this paper, we perform Raman measurements of p-aminothiophenol on gold nanosurfaces with and without deposition of SiO2 thin films at the surface. The Raman signals are enhanced on both substrates, but the deposition of the glass thin film clearly prevents the chemical transformation. This indicates that hot electrons are effective for chemical transformation and that thin glass films are sufficient to prevent this while still benefiting from surface plasmons.

Original languageEnglish
Pages (from-to)18795-18799
Number of pages5
JournalJournal of Physical Chemistry C
Volume121
Issue number34
DOIs
Publication statusPublished - Aug 31 2017

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry

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