Surface-coverage dependence of surface-enhanced raman scattering from gold nanocubes on self-asssembled monolayers of analyte

Patrick N. Sisco, Catherine Jones Murphy

Research output: Contribution to journalArticle

Abstract

Surface enhanced Raman scattering (SERS) spectra of 4-mercaptobenzoic acid (4-MBA) self-assembled monolayers (SAMs) on gold substrates are presented for SAMs onto which gold nanocubes have been electrostaticaly immobilized. In the absence of nanocubes, no SERS signals from 4-MBA SAMs are observed. Upon addition of the gold nanocubes to the SAM, a sandwich architecture is formed, allowing for coupling between the localized surface plasmon of the nanocubes and the surface plasmon of the gold substrate. This creates a large electromagnetic field in the area where the 4-MBA molecules reside, causing the characteristic vibrational modes of 4-MBA to appear. SERS intensities increase linearly with increasing nanocube coverage up to a factor of 7 in the best case studied here, with enhancement factors of up to 1013.

Original languageEnglish (US)
Pages (from-to)3973-3978
Number of pages6
JournalJournal of Physical Chemistry A
Volume113
Issue number16
DOIs
StatePublished - Apr 23 2009
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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