Gold/palladium and silver/palladium colloids as novel metallic substrates for surface-enhanced Raman scattering.
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.
Pergolese
Barbara
B
Department of Chemical Sciences, University of Trieste, Trieste, I-34127 Italy. pergoles@dsch.univ.trieste.it
Bigotto
Adriano
A
Muniz-Miranda
Maurizio
M
Sbrana
Giuseppe
G
D020099:Coated Materials, Biocompatible / Q000032:analysis / Q000737:chemistry; D003102:Colloids / Q000032:analysis / Q000737:chemistry; D017979:Gold Colloid / Q000032:analysis / Q000737:chemistry*; D008422:Materials Testing; D008968:Molecular Conformation; D043942:Nanotubes / Q000032:analysis / Q000737:chemistry; D010165:Palladium / Q000032:analysis / Q000737:chemistry*; D010316:Particle Size; D012542:Scattering, Radiation; D012834:Silver / Q000032:analysis / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods*
D020099:Coated Materials, Biocompatible; D003102:Colloids; D017979:Gold Colloid; D012834:Silver; D010165:Palladium