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Synthesis of Aerogel-Metal Cluster Composites by Gamma Radiolysis

Published online by Cambridge University Press:  11 February 2011

Massimo F. Bertino ,
Jared F. Hund ,
Guohui Zhang ,
Chariklia Sotiriou-Leventis ,
Nicholas Leventis ,
Akira T. Tokuhiro  and
John Farmer
Massimo F. Bertino
Affiliation:
Department of Physics, University of Missouri-Rolla, Rolla, MO 65409, USA
Jared F. Hund
Affiliation:
Department of Physics, University of Missouri-Rolla, Rolla, MO 65409, USA
Guohui Zhang
Affiliation:
Department of Chemistry, University of Missouri-Rolla, Rolla, MO 65409, USA
Chariklia Sotiriou-Leventis
Affiliation:
Department of Chemistry, University of Missouri-Rolla, Rolla, MO 65409, USA
Nicholas Leventis
Affiliation:
Department of Chemistry, University of Missouri-Rolla, Rolla, MO 65409, USA
Akira T. Tokuhiro
Affiliation:
Department of Nuclear Engineering, University of Missouri-Rolla, Rolla, MO 65409, USA
John Farmer
Affiliation:
MURR, University of Missouri-Columbia, Columbia, MO 65211, USA.
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Abstract

Noble metal clusters (Ag, Au) were formed in a silica aerogel matrix by gamma irradiation of hydrogel precursors loaded with aqueous solutions containing Ag+ or [AuCl4]- ions. Hydrogels exposed to gamma rays assumed the color expected for colloidal suspensions of Ag (respectively Au) clusters. The hydrogels were subsequently washed and supercritically dried, without any evident change in color, indicating that the metal clusters were not removed during drying. Typical gamma ray doses were between 3 and 3.5 kGy, and achieved complete reduction of hydrogels containing metal ion concentrations in the 10-4-10-3 M range. Metal clusters in the aerogel monoliths were characterized with optical absorption, transmission electron microscopy, X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy. These techniques have shown that the clusters have a crystalline fcc structure. Au clusters consist of pure Au, while surface oxidation of Ag clusters was observed with XPS.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 740: Symposium I – Nanomaterials for Structural Applications , 2002 , I7.15
Copyright
Copyright © Materials Research Society 2003

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References

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