tailieunhanh - Báo cáo hóa học: "Shock-induced breaking of the nanowire with the dependence of crystallographic orientation and strain rate"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Shock-induced breaking of the nanowire with the dependence of crystallographic orientation and strain rate | Wang et al. Nanoscale Research Letters 2011 6 291 http content 6 1 291 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Shock-induced breaking of the nanowire with the dependence of crystallographic orientation and strain rate Fenying Wang Yajun Gao Tiemin Zhu and Jianwei Zhao Abstract The failure of the metallic nanowire has raised concerns due to its applied reliability in nanoelectromechanical system. In this article the breaking failure is studied for the 100 110 and 111 single-crystal copper nanowires at different strain rates. The statistical breaking position distributions of the nanowires have been investigated to give the effects of strain rate and crystallographic orientation on micro-atomic fluctuation in the symmetric stretching of the nanowires. When the strain rate is less than ps-1 macro-breaking position distributions exhibit the anisotropy of micro-atomic fluctuation. However when the strain rate is larger than ps-1 the anisotropy is not obvious because of strong symmetric shocks. Introduction In recent years the metallic nanowires applied as nanoconnectors 1 and the active components of nanoelectromechanical system NEMS devices 2 3 have attracted extensive interests owing to their special mechanical 4 thermal 5 electrical 6 and magnetic 7 properties. The approaches to investigate nanowires in experiments include using scanning tunneling microscopy STM 8 9 atomic force microscopy AFM 10 transmission electron microscope TEM 11 12 and mechanically controllable break junctions MCBJ 13 14 . However it is difficult to manipulate the deformation processes when the nanowires are applied in NEMS because controlling the failure of the nanowires is a challenging thing due to their small scales. Hemker 15 proposed the reliability of NEMS would require a fundamental description of its deformation mechanism which must be based on a corresponding solid understanding. In contrast molecular dynamics MD