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Controlled Formation of Quantum Size Metal and Semiconductor Particles from Aqueous Solutions

Published online by Cambridge University Press:  28 February 2011

Ramesh C. Patel ,
Jovan Nedeljkovic  and
Olga Micic
Ramesh C. Patel
Affiliation:
Clarkson University, Department of Chemistry, Potsdam, NY 13699–5810, U.S.A.
Jovan Nedeljkovic
Affiliation:
Clarkson University, Department of Chemistry, Potsdam, NY 13699–5810, U.S.A.
Olga Micic
Affiliation:
Boris Kidric Institute of Nuclear Sciences, Vinca, Belgrade, Yugoslavia.
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Abstract

Photochemical and chemical reduction methods are described for the controlled formation of metallic silver in aqueous solutions. The former approach is capable of generally depositing a number of metals. When spherical silver bromide particles are the substrates, the resulting silver coated composite particles exhibit optical absorption spectra which vary with the coat thickness as theoretically predicted. In the case of spherical silica particles of uniform size, it was possible to produce both quantum size silver particles supported on silica, as well as a silver coat of variable thickness, depending on the rate of the deposition process. In addition to silica, substrates such as latex and chromium hydroxide could be used.

CdS particles with two different particle diameters (50–200 Å and < 30 Å) were subjected to 308 nm excimer laser irradiation at 77 K, and the subsequent charge carrier processes studied by ESR. Dramatic differences in the ESR signals as a function of decreasing particle size could be observed, consistent with the localization of charge carriers on numerous surface sites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 206: Symposium G – Clusters and Cluster-Assembled Materials , 1990 , 303
Copyright
Copyright © Materials Research Society 1991

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References

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