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Experimental demonstration of the electromagnetic mechanism underlying surface enhanced Raman scattering using single nanoparticle spectroscopy

Paper ID Volume ID Publish Year Pages File Format Full-Text
27455 44024 2011 13 PDF Available
Title
Experimental demonstration of the electromagnetic mechanism underlying surface enhanced Raman scattering using single nanoparticle spectroscopy
Abstract

Nanostructures and nanoparticles of Ag and Au offer large enhancements of optical responses such as optical absorption, Rayleigh and Raman scatterings and their nonlinear counterparts to adsorbed molecules. Such enhancements originate from the strong plasma (plasmon) resonance of Ag and Au and have been widely applied for the sensitive detection of various organic and biomolecules under the terminology of surface enhanced spectroscopy, the most common example being surface enhanced Raman scattering (SERS). Although SERS has turned out to be one of the most sensitive analytical techniques, fundamental issues such as lack of conclusive experimental evidence for validating the mechanism underlying SERS and difficulty to establish potential applications of SERS in daily life limit its recognition. Single nanoparticle spectroscopy due to its ability to correlate enhanced Raman scattering with other optical properties of metal nanoparticles is a powerful method for clarifying the mechanism underlying SERS. In this article, we review our recent advances in the experimental evaluation of SERS mechanism. In particular, using single nanoparticle spectroscopy, we attempted to quantitatively evaluate the enhancement mechanism underlying SERS at the onset of electromagnetic (EM) theory. Also, we briefly comment on the advantages of SERS over fluorescence spectroscopy for label-free detection of biomolecules by taking examples from our own investigations and recent reports by others.

► Quantitative evaluation of SERS mechanism using single nanoparticle microspectroscopy within the framework of the electromagnetic theory. ► Relationship among SERS spectra, plasma (plasmon) resonance spectra, and shapes of single silver dimers adsorbed by near single molecules. ► Comment on the advantages of SERS over fluorescence spectroscopy for label-free detection of biomolecules by taking our examples.

Keywords
SERS; Plasma (plasmon) resonance; Ag nanoaggregate; Twofold electromagnetic enhancement; Single nanoparticle spectroscopy
First Page Preview
Experimental demonstration of the electromagnetic mechanism underlying surface enhanced Raman scattering using single nanoparticle spectroscopy
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 219, Issues 2–3, 15 April 2011, Pages 167–179
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering