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J Chem Phys. 2006 Feb 14;124(6):61101.

Exploring the chemical enhancement for surface-enhanced Raman scattering with Au bowtie nanoantennas.

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1
Department of Chemistry, Stanford University, California 94305, USA.

Abstract

Single metallic bowtie nanoantennas provide a controllable environment for surface-enhanced Raman scattering (SERS) of adsorbed molecules. Bowties have experimentally measured electromagnetic enhancements, enabling estimation of chemical enhancement for both the bulk and the few-molecule regime. Strong fluctuations of selected Raman lines imply that a small number of p-mercaptoaniline molecules on a single bowtie show chemical enhancement >10(7), much larger than previously believed, likely due to charge transfer between the Au surface and the molecule. This chemical sensitivity of SERS has significant implications for ultra-sensitive detection of single molecules.

PMID:
16483189
PMCID:
PMC1513182
DOI:
10.1063/1.2167649
[Indexed for MEDLINE]
Free PMC Article

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