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Volume 132, 2006
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Re-examining the origins of spectral blinking in single-molecule and single-nanoparticle SERS

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Abstract

Single metal nanoparticles and nanoaggregates are known to emit intense bursts of surface-enhanced Raman scattering (SERS) in an intermittent on and off fashion. The characteristic “blinking” timescales range from milliseconds to seconds. Here we report detailed temperature dependence (both heating and cooling) and light-intensity studies to further examine the origins of this intriguing phenomenon. The results indicate that blinking SERS contains both a thermo-activated component and a light-induced component. Several lines of evidence suggest that the observed fluctuations are caused by thermally activated diffusion of individual molecules on the particle surface, coupled with photo-induced electron transfer and structural relaxation of surface active sites or atomic-scale roughness features.

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Publication details

The article was received on 29 Jun 2005, accepted on 14 Jul 2005 and first published on 04 Oct 2005


Article type: Paper
DOI: 10.1039/B509223J
Citation: Faraday Discuss., 2006,132, 249-259
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    Re-examining the origins of spectral blinking in single-molecule and single-nanoparticle SERS

    S. R. Emory, R. A. Jensen, T. Wenda, M. Han and S. Nie, Faraday Discuss., 2006, 132, 249
    DOI: 10.1039/B509223J

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