Direct demonstration of environment-sensitive surface plasmon resonance band in single gold nanoparticles

Tamitake Itoh, Tsuyoshi Asahi*, Hiroshi Masuhara

*Corresponding author for this work

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

We investigated single gold nanoparticles embedded in poly(vinyl alcohol) (PVA) films with different thicknesses using Rayleigh light-scattering microspectroscopy. First, gold nanoparticles with a mean radius of 40 nm were dispersed in a thin polymer film. Then, the film was covered with multiple layers of PVA to the desired thickness. As a result, we confirmed that the surface plasmon (SP) resonance band of single particles demonstrated redshift with the film thickness increase. In a thick film, the SP band peak position was well explained in terms of the size of the gold nanoparticles. In contrast, the spectral variance observed in a thin film did not follow the size-dependence trend. Since nanoparticles in a thin film are partially covered with PVA layers and thus are partially exposed to air, our results confirm that SP resonance strongly depends not only on a particle's size but also on its surrounding dielectric conditions.

Original languageEnglish
Pages (from-to)L76-L78
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume41
Issue number1 A/B
DOIs
StatePublished - 15 Jan 2002

Keywords

  • Light-scattering microspectroscopy
  • Mie theory
  • Poly(vinyl alcohol)
  • Single gold nanoparticle
  • Surface plasmon

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