The role of the dielectric environment in surface-enhanced Raman scattering on the detection of a 4-nitrothiophenol monolayer

Nanotechnology enables the generation and characterization of novel surface‐enhanced Raman scattering (SERS) substrates. In this study, we focus on the impact of the carrier material of the SERS active layer and hence the dielectric environment to the enhancement. Therefore, a self‐assembled monolay...

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Bibliographic Details
Published in:Journal of Raman spectroscopy 2013-07, Vol.44 (7), p.1010-1013
Main Authors: Funke, Sebastian, Wackerbarth, Hainer
Format: Article
Language:English
Subjects:
Bands
Carriers
dielectric properties
Dielectrics
Gold
monolayer
Monolayers
Quartz
Raman scattering
Silver
surface-enhanced Raman
theory
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Summary:Nanotechnology enables the generation and characterization of novel surface‐enhanced Raman scattering (SERS) substrates. In this study, we focus on the impact of the carrier material of the SERS active layer and hence the dielectric environment to the enhancement. Therefore, a self‐assembled monolayer of 4‐nitrothiophenol is immobilized on silver and gold particles substrates on a quartz carrier. The detection of the monolayer occurs through the quartz carrier and through air. For the former, an increase of the intensity of the SERS bands in the spectrum is observed compared to the latter. The magnitude of the increase is larger for gold than for silver. Calculations according to the theoretical model of the electromagnetic enhancement agree with our experimental data. The presented detection mode will stimulate the fabrication of novel SERS sensors. Copyright © 2013 John Wiley & Sons, Ltd. The intensity of the surface‐enhanced Raman scattering spectrum is improved, when the light is transmitted through the quartz slide compared to direct illumination through air and the adsorbed molecules on the surface.
ISSN:0377-0486
1097-4555
DOI:10.1002/jrs.4323