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Issue 38, 2015
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Effect of surface energy on size-dependent deformation twinning of defect-free Au nanowires

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Abstract

In this study, we report the size-dependent transition of deformation twinning studied using in situ SEM/TEM tensile testing of defect-free [110] Au nanowires/ribbons with controlled geometry. The critical dimension below which the ordinary plasticity transits to deformation twinning is experimentally determined to be ∼170 nm for Au nanowires with equilateral cross-sections. Nanoribbons with a fixed thickness but increased width-to-thickness ratios (9 : 1) were also studied to show that an increase in the surface energy due to the crystal re-orientation suppresses the deformation twinning. Molecular dynamics simulations confirmed that the transition from partial dislocation mediated plasticity to perfect dislocation plasticity with increase in the width-to-thickness ratio is due to the effect of the surface energy.

Graphical abstract: Effect of surface energy on size-dependent deformation twinning of defect-free Au nanowires

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The article was received on 13 Jun 2015, accepted on 17 Aug 2015 and first published on 20 Aug 2015


Article type: Paper
DOI: 10.1039/C5NR03902A
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Nanoscale, 2015,7, 15657-15664

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    Effect of surface energy on size-dependent deformation twinning of defect-free Au nanowires

    B. Hwang, M. Kang, S. Lee, C. R. Weinberger, P. Loya, J. Lou, S. H. Oh, B. Kim and S. M. Han, Nanoscale, 2015, 7, 15657
    DOI: 10.1039/C5NR03902A

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