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Annealing effects on the elastic modulus of tungsten oxide nanowires

Published online by Cambridge University Press:  31 January 2011

Yanwu Zhu ,
Yousheng Zhang ,
Fook-Chiong Cheong ,
Chorng-Haur Sow  and
Chwee-Teck Lim
Yanwu Zhu
Affiliation:
NUS Nanoscience & Nanotechnology Initiative, National University of Singapore, Singapore 117576, Singapore
Yousheng Zhang
Affiliation:
NUS Nanoscience & Nanotechnology Initiative, National University of Singapore, Singapore 117576, Singapore
Fook-Chiong Cheong
Affiliation:
Department of Physics, National University of Singapore, Singapore 117542, Singapore
Chorng-Haur Sow*
Affiliation:
Department of Physics and NUS Nanoscience & Nanotechnology Initiative, National University of Singapore, Singapore 117542, Singapore
Chwee-Teck Lim
Affiliation:
Division of Bioengineering & Department of Mechanical Engineering and NUS Nanoscience & Nanotechnology Initiative, National University of Singapore, Singapore 117576, Singapore
*
a)Address all correspondence to these authors: a) e-mail: physowch@nus.edu.sg
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Abstract

Three-point bend test coupled with transmission electron microscopy (TEM) analysis was carried out on individual tungsten oxide nanowires (NWs) before and after annealing. Three-point bend test monitors the change in the Young’s modulus of the NW after annealing, while TEM provides nanostructural detail changes on the same NW. In this way, insight into the correlation between the mechanical properties of a NW and its nanostructure details can be obtained. Annealing increased the diameter of the NWs by forming a uniform amorphous/polycrystalline outer coating. The coating results in a decrease in Young’s moduli for thicker NWs. On the other hand, annealing led to increased Young’s moduli of thinner NWs, which is attributed to the improved crystallinity in these NWs after annealing. This study points to a more refined strategy for more in-depth understanding of the relationship between the nanostructures and elastic mechanical properties of NWs.

Keywords

Elastic propertiesNanostructureOxide
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 8 , August 2008 , pp. 2149 - 2156
Copyright
Copyright © Materials Research Society 2008

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