Measurement of the raman line widths of neat benzenethiol and a self-assembled monolayer (SAM) of benzenethiol on a silver-coated surface-enhanced raman scattering (SERS) substrate

Roshan L. Aggarwal*, Lewis W. Farrar, Nathan G. Greeneltch, Richard P. Van Duyne, Dennis L. Polla

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Raman line widths of neat benzenethiol and a self-assembled monolayer(SAM) of benzenethiol on a surface-enhanced Raman scattering (SERS) substrate have been measured using a mini spectrometer with a resolution(full width at half-maximum) of 3.3 ± 0.2 cm-1. Values of 7.3 ± 0.7,4.6 ±0.6, 2.4 ± 0.6, 3.2 ± 0.5, 8.8 ± 0.9, and 11.0 ± 1.1 cm"1 have been determined for the Raman line widths of the 414, 700, 1001, 1026, 1093,and 1584 cm-1 modes of neat benzenethiol. Values of 133 ± 0.7, 9.1 ± 0.7,5.1 ± 0.6, 5.9 ± 0.6, 13.3 ± 0.5, and 8.7 ± 0.5 cm"1 have been determined for the SERS line widths of a benzenethiol SAM on a silver-coated SERS substrate for the corresponding frequency-shifted modes at 420,691,1000,1023, 1072, and 1574 cm"1. The line widths for the SERS modes at 420,691, 1000, 1023, and 1072 cm-1 are about a factor of two larger than those of the corresponding Raman modes. However, the line width of the SERS mode at 1574 cm"1 is slightly smaller than the corresponding Raman mode at 1584 cm"1.

Original languageEnglish (US)
Pages (from-to)740-743
Number of pages4
JournalApplied Spectroscopy
Volume66
Issue number7
DOIs
StatePublished - Jul 16 2012

Keywords

  • Raman line width
  • SAM
  • SERS
  • Self-assembled monolayers
  • Surface-enhanced raman scattering

ASJC Scopus subject areas

  • Instrumentation
  • Spectroscopy

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