Self-Assembled Monolayers of Ferrocenylazobenzenes on Au(111)/Mica Films: Surface-Enhanced Raman Scattering Response vs Surface Morphology

W. Brett Caldwell, Kaimin Chen, Brian R. Herr, Chad A. Mirkin*, John C. Hulteen, Richard P. Van Duyne

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

Surface-enhanced Raman scattering (SERS) and surface-enhanced resonance Raman scattering (SERRS) results are reported for self-assembled monolayers (SAMs) of 4-(4-mercaptobutyl)-4´-ferrocenylazobenzene, compound 1, on Au/mica and Pt/mica thin films. Two different Au/mica surfaces, designated Au(rough)/mica and Au(111)/mica, have been characterized by atomic force microscopy (AFM) to define their respective surface morphologies. Cyclic voltammetry of SAMs of 1 on Au(rough)/mica, Au(lll)/mica, and Pt/mica was used to directly measure the surface coverage of 1. A quantitative determination of the contributions to the measured surface Raman intensity from adsorbate-localized resonance Raman and substratederived electromagnetic enhancement effects is made. The surprising conclusion is that Au(lll)/mica surfaces of the type traditionally used for preparing and studying SAMs are “SERS-active” without the need for additional roughening or treatment with a “SERS-active” overlayer.

Original languageEnglish (US)
Pages (from-to)4109-4115
Number of pages7
JournalLangmuir
Volume10
Issue number11
DOIs
StatePublished - Nov 1 1994

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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