Abstract
Capped Ag nanoparticles with the novel silver core−molecule−silver cap structure were synthesized and demonstrated to produce strong SERS. Plasmon-induced electronic coupling was concluded to be the major Raman enhancement mechanism. The capped nanoparticles also exhibited polarization-dependent elastic light scattering that was attributed to the particle anisotropy, which resulted from the addition of the silver cap. These particles can potentially be used as optical labels.
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