Surface-enhanced Raman spectral study of Au nano-particles/alkanethiol self-assembled monolayers/Au(1 1 1 ) heterostructures

T. Wadayama, M. Oishi

研究成果: Article査読

5 被引用数 (Scopus)

抄録

This paper describes Raman spectroscopic investigations of octadecane-thiol (C18H37-SH; OD-mT) and octane-dithiol (HS-C8H16-SH; O-dT) self-assembled monolayers (SAMs) on an epitaxial Au(1 1 1 )/cleaved-mica substrate. The epitaxial Au(1 1 1 ) substrate having nanometer-scale domains increases the enhanced Raman signals of SAMs, whereas the Raman bands are much less intense on the micrometer-scale domains of Au(1 1 1 ). The Raman intensity of the νs(CH2) band is increased for depositions above 4 nm, and takes a maximum at a thickness of 9 nm when gold is vacuum-deposited on the OD-mT SAMs that are formed on micrometer-scale domains. For the O-dT SAMs, Raman band intensity profiles show two features at gold thicknesses of 2 and 9 nm; the latter intensity is about three times greater than that of the former. Atomic force microprobe (AFM) images reveal that 20-30-nanometer-scale islands are formed by 9 nm gold deposition for both SAMs. In contrast, 2 nm gold deposition onto the O-dT SAMs creates striped nanostructures (ca. 7 nm in spacing). The results suggest that the specific nanostructures formed by post-deposition of gold serve to enhance the SAMs Raman signals.

本文言語English
ページ(範囲)4352-4356
ページ数5
ジャーナルSurface Science
600
18
DOI
出版ステータスPublished - 2006 9 15

ASJC Scopus subject areas

  • 凝縮系物理学
  • 表面および界面
  • 表面、皮膜および薄膜
  • 材料化学

フィンガープリント

「Surface-enhanced Raman spectral study of Au nano-particles/alkanethiol self-assembled monolayers/Au(1 1 1 ) heterostructures」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル