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One-step in situ synthesis and characterization of W18O49@carbon coaxial nanocables

Published online by Cambridge University Press:  31 January 2011

Yuqin Zhou ,
Yong Zhang ,
Ruying Li ,
Mei Cai  and
Xueliang Sun
Ruying Li
Affiliation:
Department of Mechanical and Materials Engineering, University of Western Ontario, London, Ontario, Canada N6A 5B9
Mei Cai
Affiliation:
General Motors Research and Development Center, Warren, Michigan 48090-9055
Xueliang Sun*
Affiliation:
Department of Mechanical and Materials Engineering, University of Western Ontario, London, Ontario, Canada N6A 5B9
*
a) Address all correspondence to this author. e-mail: xsun@eng.uwo.ca
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Abstract

We demonstrate here in situ synthesis of bulk yield W18O49@carbon coaxial nanocables based on an easily controlled chemical vapor deposition process at relatively low temperature (760 °C) using metallic tungsten powder and ethylene (C2H4) as the raw materials. Transmission electron microscope (TEM), energy dispersive x-ray (EDX), and x-ray diffraction (XRD) analyses indicate that the resultant nanostructures are composed of single-crystalline W18O49 nanowires, coaxially covered with amorphous carbon walls. A vapor–solid (VS) mechanism is proposed to interpret the formation of the nanocables. The effect of carbon sources on the nanocable growth was investigated. The results revealed that the introduction of carbon species not only causes the production of W18O49@C nanocable structures, but also obviously modulates growth behaviors and core/shell diameter ratio of the nanocables. The obtained nanocables may find great applications in catalyst systems and optical and electronic nanodevices because of their enhanced surface properties, as well as in high chemical stability.

Keywords

Chemical vapor deposition (CVD) (chemical reaction)Core/shellNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 5 , May 2009 , pp. 1833 - 1841
Copyright
Copyright © Materials Research Society 2009

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References

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