Chain-length-dependent vibrational resonances in alkanethiol self-assembled monolayers observed on plasmonic nanoparticle substrates

Carly S Levin, Benjamin G Janesko, Rizia Bardhan, Gustavo E Scuseria, Jeffrey D Hartgerink, Naomi J. Halas

Research output: Contribution to journalArticle

47 Scopus citations

Abstract

Alkanethiol self-assembled monolayers (SAMs) on gold exhibit a series of sharp resonances in their surface-enhanced Raman spectrum that depend dramatically on carbon chain length. This unusual behavior suggests a coupling of the gold-sulfur bond stretch with the longitudinal acoustic, "accordion", vibrations of the molecular alkane chain. A simple model of a one-dimensional chain attached to a surface quantitatively reproduces these previously unreported experimental observations in this important nanomaterial system.

Original languageEnglish (US)
Pages (from-to)2617-21
Number of pages5
JournalNano Letters
Volume6
Issue number11
DOIs
StatePublished - Nov 2006

Keywords

  • Alkanes
  • Carbon
  • Gold
  • Materials Testing
  • Nanoparticles
  • Sensitivity and Specificity
  • Spectrum Analysis, Raman
  • Sulfhydryl Compounds
  • Surface Properties
  • Vibration
  • Journal Article
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

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