Estimation of dielectric function of biotin-capped gold nanoparticles via signal enhancement on surface plasmon resonance

Xinheng Li, Kaoru Tamada, Akira Baba, Wolfgang Knoll, Masahiko Hara

研究成果: Article査読

49 被引用数 (Scopus)

抄録

Biotin-capped gold nanoparticles assembled on flat gold with volume fraction/are studied by surface plasmon resonance (SPR) spectroscopy and atomic force microscopy (AFM) in order to estimate the dielectric function of the gold nanoparticles based on the Maxwell-Garnett (MG) theory. The complex dielectric function (∈′, ∈″) of the spherical nanoparticles at three representative wavelengths in the vis-near-IR region, i.e., λ = 543, 632.8, and 1152 nm, is estimated for a surface homogeneously covered with nanoparticles in order to discuss the wavelength dependence of the dielectric function. The SPR response of a surface covered with particles in 2D aggregates is also analyzed. The experimental SPR curve of the particle aggregates deviates from the theoretical predictions, suggesting dipole interactions between particles.

本文言語English
ページ(範囲)15755-15762
ページ数8
ジャーナルJournal of Physical Chemistry B
110
32
DOI
出版ステータスPublished - 2006 8月 17
外部発表はい

ASJC Scopus subject areas

  • 物理化学および理論化学
  • 表面、皮膜および薄膜
  • 材料化学

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