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Synthesis and Characterization of WOx Nanowires and their Conversion to WS2 Nanotubes

Published online by Cambridge University Press:  01 February 2011

Lifeng Dong ,
Aitor Maiz  and
Jun Jiao
Lifeng Dong
Affiliation:
Department of Physics, Portland State University, Portland, OR 97201
Aitor Maiz
Affiliation:
Catlin Gabel School, Portland, OR 97225
Jun Jiao
Affiliation:
Department of Physics, Portland State University, Portland, OR 97201
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Abstract

In this paper, we report for the first time the conversion of tungsten oxide (WOx) nanowires to tungsten sulfide (WS2) nanotubes using hydrogen (H2) gas and sulfur (S) powder as precursors instead of hydrogen sulfide (H2S) gas. Both the morphology and diameter of WS2 nanotubes were affected by the use of WOx nanowires. The diameter and length of the WOx nanowires were controlled by the growth temperature. A series of experiments confirmed that the higher the temperature was, the larger and longer the diameter and length of the WOx nanowires. When the temperature increased from 600 °C to 800 °C, the nanowire diameter increased from ∼ 15 nm to ∼50 nm. Furthermore, electron microscopy characterization reveals that the conversion of WS2 nanotubes from WOx nanowires started from outside the WOx nanowires and the conversion was not symmetrically uniform along the radial directions of the WOx nanowires.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 794: Symposium T – Self-Organized Processes in Semiconductor Heteroepitaxy , 2003 , T3.11
Copyright
Copyright © Materials Research Society 2004

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References

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