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Electrical Properties of Nanocrystalline Tungsten Trioxide

Published online by Cambridge University Press:  21 February 2011

A. Hoel ,
L.B. Kish ,
R. Vajtai ,
G.A. Niklasson ,
C.G. Granqvist  and
E. Olsson
A. Hoel
Affiliation:
Department of Materials Science, The Ångström LaboratoryUppsala University, P.O. Box 534, -751 21 Uppsala, Sweden
L.B. Kish
Affiliation:
Department of Materials Science, The Ångström LaboratoryUppsala University, P.O. Box 534, -751 21 Uppsala, Sweden
R. Vajtai
Affiliation:
Department of Materials Science, The Ångström LaboratoryUppsala University, P.O. Box 534, -751 21 Uppsala, Sweden
G.A. Niklasson
Affiliation:
Department of Materials Science, The Ångström LaboratoryUppsala University, P.O. Box 534, -751 21 Uppsala, Sweden
C.G. Granqvist
Affiliation:
Department of Materials Science, The Ångström LaboratoryUppsala University, P.O. Box 534, -751 21 Uppsala, Sweden
E. Olsson
Affiliation:
Department of Materials Science, The Ångström LaboratoryUppsala University, P.O. Box 534, -751 21 Uppsala, Sweden
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Abstract

Tungsten oxide is a material of significant interest for applications in several areas. It can, for example, be used as the electrochromic film in smart windows. Tungsten trioxide nanoparticles were produced using an advanced gas evaporation unit in which the tungsten was oxidized in low pressure ambient air. The tungsten trioxide particles were formed via vapor condensation and were deposited by gas deposition technique to avoid coagulation effects. The average size of the primary particles was around 5 nm, depending on the heating power and the pressure. The particles exhibited a body centred cubic structure. The impedance spectrum of particle deposits showed resonance and negative capacitance effects. The correlation between fabrication conditions, structure and impedance spectrum is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 581: Symposium F – Nanophase & Nanocomposite Materials II , 1999 , 15
Copyright
Copyright © Materials Research Society 2000

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References

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