Controlling the surface enhanced Raman effect via the nanoshell geometry

TitleControlling the surface enhanced Raman effect via the nanoshell geometry
Publication TypeJournal Article
Year of Publication2003
AuthorsJackson, JB, Westcott, SL, Hirsch, LR, West, JL, Halas, N
JournalApplied Physics Letters
Volume82
Issue2
Pagination257
Date Published2003
ISSN00036951
Keywordsgeometry; nanoshells; SERS
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 106 are observable in aqueous solution, which correspond to absolute enhancements of 1012 when reabsorption of Raman emission by nearby nanoparticles is taken into account.

DOI10.1063/1.1534916
Short TitleAppl Phys Lett
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