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Understanding the Surface-Enhanced Raman Spectroscopy 'Background'

Mahajan, S. and Cole, R.M. and Speed, J.D. and Pelfrey, S.H. and Russell, A. and Bartlett, P.N. and Barnett, S.M. and Baumberg, J.J. (2009) Understanding the Surface-Enhanced Raman Spectroscopy 'Background'. Journal of Physical Chemistry C, 114 (16). pp. 7242-7250.

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Abstract

Even 35 years after the discovery of surface-enhanced Raman spectroscopy (SERS) much remains to be learned about the phenomenon.(1-3) Despite broad consensus on the mechanism of SERS, many features remain poorly understood and in particular much less effort has been put into understanding the continuum emission called the 'background' observed in SERS spectra. Here the SERS background is studied systematically on sphere segment void (SSV) plasmonic substrates. We establish the physicochemical dependence of the background on plasmons, the identity of the adsorbate, adsorbate coverage and electrochemical potential. In particular, by exchanging electron-donating and electron-withdrawing adsorbates, we demonstrate predictable modulation of the SERS background. Using these observations, we propose a model for the origin of the SERS background. Finally, we test the proposed model against its predictions for anti-Stokes SERS spectra.

Item type: Article
ID code: 27300
Notes: NO CONTACT EMAIL
Keywords: raman spectroscopy, Physics, Surfaces, Coatings and Films, Energy(all), Physical and Theoretical Chemistry, Electronic, Optical and Magnetic Materials
Subjects: Science > Physics
Department: Faculty of Science > Physics
Unknown Department
Depositing user: Miss Leonie Airley
Date Deposited: 01 Sep 2010 09:48
Last modified: 21 May 2015 12:28
URI: http://strathprints.strath.ac.uk/id/eprint/27300

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