Advanced Functional Materials
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Gold Nanoparticles: Fluorescence of Colloidal Gold Nanoparticles is Controlled by the Surface Adsorbate (Adv. Funct. Mater. 9/2012)
The image shows three gold nanoparticles with varying levels of surface adsorbate (shown as brown patches on nanoparticle surface) but that are otherwise identical. Both the excitation and emission spectra shift as a result; this is indicated by varying colors of exciting laser beams and simultaneously varying colors of nanoparticle fluorescence. The article by Ewa M. Goldys and Mushtaq A. Sobhan on page 1906 explains the microscopic mechanism behind this observation.