Surface-enhanced Raman spectroelectrochemistry of TTF-modified self-assembled monolayers

Walter F. Paxton, Samuel L. Kleinman, Ashish N. Basuray, J. Fraser Stoddart, Richard P. Van Duyne

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Surface-enhanced Raman spectroscopy (SERS) was used to monitor the response of a self-assembled monolayer (SAM) of a tetrathiafulvalene (TTF) derivative on a gold film-over-nanosphere electrode. The electrochemical response observed was rationalized in terms of the interactions between TTF moieties as the oxidation state was changed. Electrochemical oxidation to form the monocation caused the absorbance of the TTF unit to coincide with both the laser excitation wavelength and the localized surface plasmon resonance (LSPR), resulting in surface-enhanced resonance Raman scattering (SERRS). The vibrational frequency changes that accompany electron transfer afford a high-contrast mechanism that can be used to determine the oxidation state of the TTF unit in an unambiguous manner.

Original languageEnglish (US)
Pages (from-to)1145-1149
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume2
Issue number10
DOIs
StatePublished - May 19 2011

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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