Voltage-induced adsorbate damping of single gold nanorod plasmons in aqueous solution.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 22313237.
- Also identified by DOI 10.1021/nl203673g.
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Abstract
Unbiased gold nanoparticles are negatively charged in aqueous solution but not hydrated. Optical spectroscopy of voltage-clamped single gold nanoparticles reveals evidence that anion adsorption starts at positive potentials above the point of zero charge, causing severe but reversible plasmon damping in combination with a spectral red shift exceeding the linear double layer charging effect. Plasmon damping by adsorbate is relevant for the use of nanoparticles in catalysis, in biodiagnostics, and in surface enhanced Raman scattering.
Medical subject headings
- Gold
- Nanostructures
- Surface Plasmon Resonance
- Water