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Nanocomposite Dielectric Material: Au/SiO2-gel

Published online by Cambridge University Press:  25 February 2011

G.C. Vezzoli  and
M.F. Chen
G.C. Vezzoli
Affiliation:
U.S. Army Research Laboratory Materials Directorate Ceramics Division Watertown, MA 02172–0001
M.F. Chen
Affiliation:
U.S. Army Research Laboratory Materials Directorate Ceramics Division Watertown, MA 02172–0001
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Abstract

A nanocomposite of clusters of gold atoms in a silica gel matrix has been prepared by the sol-gel technique through reduction of gold chloride. This composite was fabricated to explore novel techniques for materialsengineering new high dielectric strength substances for capacitor applications. The gold islands amidst the silica gel sea are materials-designed to utilize the percolation threshhold phenomenon to create a peak in the dielectric

constant as a function of optimal topology. Experimental results indicate an average dielectric constant of the order of 5000 at 1 kHz, and a maximum versus temperature at ∼ −100°C. Electron microscope and microprobe analysis indicate ellipsoidal Au particles or clusters of a dimension ranging from a hundred angstroms to several thousand angstroms.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 286: Symposium J – Nanophase and Nanocomposite Materials , 1992 , 271
Copyright
Copyright © Materials Research Society 1993

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References

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