TITLE

Controlling the surface enhanced Raman effect via the nanoshell geometry

AUTHOR(S)
Jackson, J. B.; Westcott, S. L.; Hirsch, L. R.; West, J. L.; Halas, N. J.
PUB. DATE
January 2003
SOURCE
Applied Physics Letters;1/13/2003, Vol. 82 Issue 2, p257
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Systematic variation of the internal geometry of a dielectric core-metal shell nanoparticle allows the local electromagnetic field at the nanoparticle surface to be precisely controlled. The strength of the field as a function of core and shell dimension is measured by monitoring the surface enhanced Raman scattering (SERS) response of nonresonant molecular adsorbates (para-mercaptoaniline) bound to the nanoparticle surface. The SERS enhancement appears to be directly and exclusively due to nanoparticle geometry. Effective SERS enhancements of 10[sup 6] are observable in aqueous solution, which correspond to absolute enhancements of 10[sup 12] when reabsorption of Raman emission by nearby nanoparticles is taken into account.
ACCESSION #
8858606

 

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