Journal
CHEMICAL PHYSICS LETTERS
Volume 452, Issue 1-3, Pages 115-119Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2007.12.042
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Aggregates of An nanoshells on silicon substrates with plasmon resonances tuned to the infrared region of the spectrum provide a remarkably high-quality substrate for surface enhanced infrared absorption (SEIRA) spectroscopy. SEIRA spectra spanning the chemical fingerprint region of 700-3300 cm(-1) with strong enhancement across this entire spectral range are obtained. SEIRA enhancement factors obtained for para-mercaptoaniline on these substrates are evaluated to be in the 104 range, based on a statistical evaluation of aggregate geometries combined with finite difference time domain modeling of the infrared 'hot spots' characteristic of the constituent structures. (c) 2007 Elsevier B.V. All rights reserved.
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