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Title: How Far Can We Probe by SERS?
Authors: Kumari, Gayatri
Kandula, Jyothirmayee
Narayana, Chandrabhas
Keywords: Physical Chemistry
Nanoscience & Nanotechnology
Materials Science
Surface-Enhanced Raman
Gold Nanoparticles
Issue Date: 2015
Publisher: American Chemical Society
Citation: Journal of Physical Chemistry C
Kumari, G.; Kandula, J.; Narayana, C., How Far Can We Probe by SERS? Journal of Physical Chemistry C 2015, 119 (34), 20057-20064.
Abstract: Surface-enhanced Raman spectroscopy (SERS) has gained paramount importance in the recent past due to its widespread applications in biodetection, monitoring chemical reactions, small molecule protein interactions, etc. It is believed that SERS is a distance-dependent phenomenon and is effective within 1 nm from the nanoparticle surface. In this work, we have investigated this distance dependence of SERS as a function of nanoparticle size. Earlier attempts have made use of flexible separators, like DNA and chemical molecules, between nanoparticle and analyte to vary the distance. We have used silica coating to vary the distance, without ambiguity, of the analyte from the silver nanopartide surface. Our results suggest that SERS is observed up to a distance of 1 nm for 20 nm silver nanopartides juxtaposed to 5 nm in the case of 90 nm silver nanopartides. This is due to large scattering cross sections and increased radiative damping in the case of the larger nanopartides. This study gives direct correlation between the size of nanopartides and distance probed through SERS which would aid in designing nanoparticle system for various applications and analytes in the future.
Description: Restricted access
ISSN: 1932-7447
Appears in Collections:Research Articles (Chandrabhas N.)

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