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Effective geometric size and bond-loss effect in nanoelasticity of GaN nanowires

R.J. Wang, C.Y. Wang, Y.T. Feng, Yuntian Feng Orcid Logo, Chengyuan Wang Orcid Logo

International Journal of Mechanical Sciences, Volume: 130, Pages: 267 - 273

Swansea University Authors: Yuntian Feng Orcid Logo, Chengyuan Wang Orcid Logo

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DOI (Published version): 10.1016/j.ijmecsci.2017.06.026

Abstract

This paper aims to identify a well-defined effective diameter of Nanowires (NWs) in evaluating their Young's modulus and to investigate the physical mechanisms behind the achieved surface elasticity. To this end, GaN NWs were considered for which a layer-wise model was developed and the tensile...

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Published in: International Journal of Mechanical Sciences
ISSN: 00207403
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa34386
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Abstract: This paper aims to identify a well-defined effective diameter of Nanowires (NWs) in evaluating their Young's modulus and to investigate the physical mechanisms behind the achieved surface elasticity. To this end, GaN NWs were considered for which a layer-wise model was developed and the tensile tests were performed based on molecular statics simulations (MSS). It was shown that two previously defined effective diameters result in an opposing effect of the surface elasticity and reversed size-dependence of the overall Young's modulus. Subsequently, a proper effective diameter was decided for the NWs, which enables one to correctly interpret atomistic simulations in terms of continuum mechanics concepts. In particular, clear evidence was attained showing that the bond loss on the NW surface results in around 43% surface softening relative to the NW interior and bulk material.
Keywords: GaN Nanowires; Surface elasticity; Size-dependence; Bond-loss effect; Effective size
College: Faculty of Science and Engineering
Start Page: 267
End Page: 273

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