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Synthesis and characterization of tungsten oxide nanorods

Published online by Cambridge University Press:  01 December 2004

D.Z. Guo ,
K. Yu-Zhang ,
A. Gloter ,
G.M. Zhang  and
Z.Q. Xue
D.Z. Guo
Affiliation:
Department of Electronics, Peking University, Beijing 100871, People’s Republic of China; and Laboratoire de Microscopies et d’Etude de Nanostructures, Université de Reims, 51687 Reims cedex 02, France
K. Yu-Zhang
Affiliation:
Laboratoire de Microscopies et d’Etude de Nanostructures, Université de Reims, 51687 Reims cedex 02, France
A. Gloter
Affiliation:
Laboratoire de Physique des Solides, Université Paris-Sud, CNRS UMR 8502, 91405 Orsay, France
G.M. Zhang
Affiliation:
Department of Electronics, Peking University, Beijing 100871, People’s Republic of China
Z.Q. Xue
Affiliation:
Department of Electronics, Peking University, Beijing 100871, People’s Republic of China
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Abstract

Single crystalline nanorods (15–200 nm in diameter and hundreds nanometers in length) have been formed on the carbon-covered W wires by simple electric heating under a vacuum of 5 × 10−4 Pa. The chemical composition and crystalline structure of the nanorods were carefully investigated by various characterization techniques such as scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, energy dispersive x-ray spectroscopy and electron energy loss spectroscopy. After ruling out any possible existence of carbon nanotubes (CNTs), tungsten carbide, W–Fe alloying, and formation of other types of tungsten oxides, monoclinic W18O49 phase has been well identified. The mechanism of nanorod formation of sub-tungsten oxide (∼WO2.7 compared to WO3) will be discussed in relation to the sample preparation conditions.

Keywords

Electron energy loss specscopy (EELS)NanoscaleTranmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 12 , December 2004 , pp. 3665 - 3670
Copyright
Copyright © Materials Research Society 2004

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