Gold/palladium and silver/palladium colloids as novel metallic substrates for surface-enhanced Raman scattering |
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Authors: | Pergolese Barbara Bigotto Adriano Muniz-Miranda Maurizio Sbrana Giuseppe |
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Affiliation: | Department of Chemical Sciences, University of Trieste, Trieste, I-34127 Italy. pergoles@dsch.univ.trieste.it |
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Abstract: | New surface-enhanced Raman scattering (SERS) substrates, composed of gold or silver colloidal nanoparticles doped with palladium, were prepared. These novel colloids are stable and maintain a satisfactory SERS efficiency, even after long aging. The interest in doping the coinage metal nanoparticles with palladium is due to the well-known catalytic activity of this metal. Transmission electron microscopy (TEM) and ultraviolet-visible absorption spectroscopy were used to characterize the shape and size of the metal particles. It was found that these bimetallic colloidal nanoparticles have a core-shell structure, with gold or silver coated with palladium clusters. |
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