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Chemical and Sonochemical Approaches to the Formation of VO2 Films and VO2-Impregnated Materials

Published online by Cambridge University Press:  10 February 2011

V. Keppens ,
D. Mandrus  and
L. A. Boatner
V. Keppens
Affiliation:
Oak Ridge National Laboratory, Solid State Division, P.O. Box 2008, Oak Ridge TN 37831–6056
D. Mandrus
Affiliation:
Oak Ridge National Laboratory, Solid State Division, P.O. Box 2008, Oak Ridge TN 37831–6056
L. A. Boatner
Affiliation:
Oak Ridge National Laboratory, Solid State Division, P.O. Box 2008, Oak Ridge TN 37831–6056
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Abstract

A new chemical and chemical/ultrasonic approach to the preparation of VO2 films and VO2-impregnated bulk materials has been developed. In this approach, a V2O5 sol prepared by quenching is used to coat SiO2 substrates. The resulting gel-film is heat treated in a reducing atmosphere to form a film identified as VO2 from the results of X-ray diffraction and both optical and resistivity measurements, which reveal the phase transition characteristic of vanadium dioxide. The advantage of this approach to the formation of VO2 is that the V2O5 sol can be used to impregnate porous materials, which are then heat treated to form an optically active composite material. The switching properties of the VO2 films are investigated using optical and resistivity measurements, and the results are compared to those obtained for VO2-films prepared by more-conventional methods.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 495: Symposium W – Chemical Aspects of Electronic Ceramics Processing , 1997 , 439
Copyright
Copyright © Materials Research Society 1998

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References

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