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Nanocomposites Containing Nanoclusters of Metals or Semiconductors

Published online by Cambridge University Press:  15 February 2011

Kimberly J. Burnam ,
Joseph P. Carpenter ,
Charles M. Lukehart ,
Stephen B. Milne ,
S. R. Stock ,
R. Glosser  and
Bobby D. Jones
Kimberly J. Burnam
Affiliation:
Vanderbilt University, Department of Chemistry, Nashville, TN 37235
Joseph P. Carpenter
Affiliation:
Vanderbilt University, Department of Chemistry, Nashville, TN 37235
Charles M. Lukehart
Affiliation:
Georgia Institute of Technology, School of Materials Science and Engineering, Atlanta, GA 30332-0245
Stephen B. Milne
Affiliation:
Vanderbilt University, Department of Chemistry, Nashville, TN 37235
S. R. Stock
Affiliation:
Georgia Institute of Technology, School of Materials Science and Engineering, Atlanta, GA 30332-0245
R. Glosser
Affiliation:
University of Texas at Dallas, Department of Physics, Richardson, TX 75083
Bobby D. Jones
Affiliation:
University of Texas at Dallas, Department of Physics, Richardson, TX 75083
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Abstract

Neutral, low-valent complexes of transition metals or an organometallic compound of Ge are prepared containing ancillary ligands which bear silicate ester or (alkoxy)silicon functional groups. Inclusion of these molecules as dopant species in a conventional sol-gel synthesis of silica xerogels affords silica xerogels in which dopant molecules have presumably been covalently incorporated into the xerogel matrix with uniform and high dispersion. Subsequent thermal treatment of these molecularly doped xerogels under reducing or oxidizing/reducing conditions gives nanocomposites containing nanoclusters of metals or semiconductor substances. By this procedure, nanocomposites containing nanoclusters of Ag, Cu, Pt, Os, CCo3, Fe2P, Ni2P, or Ge have been prepared. Preliminary evidence for the formation of a nanocomposite containing Pt-Sn nanoclusters derived from a bimetallic molecular precursor is also presented. Characterization data for the nanocomposite materials include TEM, electron diffraction, EDS, XRD, and selected use of micro-Raman spectroscopy. These results support the hypothesis that covalent incorporation of molecular precursors containing low-valent metals into a silica xerogel can afford nanocluster phases with high dispersion, relatively small particle size, and unusual elemental composition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 351: Symposium V – Molecularly Designed Ultrafine/Nanostructured Materials , 1994 , 21
Copyright
Copyright © Materials Research Society 1994

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