Effect of surface energy on size-dependent deformation twinning of defect-free Au nanowiresElectronic supplementary information (ESI) available. See DOI: 10.1039/c5nr03902a

• Main Authors: Hwang, Byungil, Kang, Mijeong, Lee, Subin, Weinberger, Christopher R, Loya, Phillip, Lou, Jun, Oh, Sang Ho, Kim, Bongsoo, Han, Seung Min
• Format: Journal Article
• Language: English
• Published: 24.09.2015
• ISSN: 2040-3364; 2040-3372
• DOI: 10.1039/c5nr03902a

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. 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.