Abstract
CdS/Ag coated particles of nanometer dimensions have been fabricated in a glass host by a modified melt/quench process. These coated particles exhibit surface plasmon resonance absorption spectra which are red-shifted, as compared to that of a dispersion of homogeneous Ag particles of similar size in the same host. This phenomenon is interpreted within the context of Maxwell-Garnett theory for small volume fractions. The calculated absorption spectra of coated Ag particles agree well with experimental results. Processing conditions determine whether metal-coated semiconductor or semiconductor-coated metal particles are formed.
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