Effects of extraneous surface charges on the enhanced Raman scattering from metallic nanoparticles

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Original languageEnglish
Article number224101
Journal / PublicationJournal of Chemical Physics
Volume138
Issue number22
Publication statusPublished - 14 Jun 2013
Externally publishedYes

Abstract

Motivating by recent experiments on surface enhanced Raman scattering (SERS) from colloidal solutions, we present here a simple model to elucidate the effects of extraneous surface charges on the enhanced Raman signal. The model is based on the well-established Gersten-Nitzan model coupled to the modified Mie scattering theory of Bohren and Hunt in the long wavelength approximation. We further introduce corrections from the modified long wavelength approximation to the Gersten-Nitzan model for the improvement of its accuracy. Our results show that the surface charge will generally lead to a blueshift in the resonance frequency and greater enhancements in the SERS spectrum. Possible correlations with the recent experiments are elaborated. © 2013 AIP Publishing LLC.

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