Journal
FARADAY DISCUSSIONS
Volume 132, Issue -, Pages 249-259Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b509223j
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Funding
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM058173] Funding Source: NIH RePORTER
- NIGMS NIH HHS [R01 GM058173] Funding Source: Medline
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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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