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Shock-induced breaking of the nanowire with the dependence of crystallographic orientation and strain rate.

Wang F, Gao Y, Zhu T, Zhao J - Nanoscale Res Lett (2011)

Bottom Line: The failure of the metallic nanowire has raised concerns due to its applied reliability in nanoelectromechanical system.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.However, when the strain rate is larger than 3.54% ps-1, the anisotropy is not obvious because of strong symmetric shocks.

View Article: PubMed Central - HTML - PubMed

Affiliation: Key Laboratory of Analytical Chemistry for Life Sciences, Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210008, P, R, China. zhaojw@nju.edu.cn.

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 0.26% ps-1, macro-breaking position distributions exhibit the anisotropy of micro-atomic fluctuation. However, when the strain rate is larger than 3.54% ps-1, the anisotropy is not obvious because of strong symmetric shocks.

No MeSH data available.


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Schematic illustration of the theoretical models.
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Figure 1: Schematic illustration of the theoretical models.

Mentions: It is also worth noting that the nanowires not only behave as intrinsic properties like bulk materials, but also have their special microcosmic behaviors due to nanoscale effects. In our previous work [25,26], the breaking uncertainty of the nanowire was found when the nanowire was stretched at different lengths and strain rates. The similar microscopic phenomena in experiments were also found in the metallic and the molecular junction conductance followed by a statistical distribution [27,28]. In our study, we designed different initial equilibrium states to investigate statistically the [100], [110], and [111] single-crystal copper nanowires. As shown in Figure 1, we propose a theoretical explanation for the relationship of micro-atomic fluctuation and macro-breaking position distribution based on symmetric stretching and structural anisotropy. We find micro-atomic fluctuation plays a critical role in the deformation of nanowires. At low strain rates, macro-breaking position distributions reflect anisotropic characters of the single-crystal nanowires, whereas the anisotropic characters behave unobvious at high strain rates because shocks induced by strong symmetric stretching dominate the breaking failure at two ends of the nanowires.


Shock-induced breaking of the nanowire with the dependence of crystallographic orientation and strain rate.

Wang F, Gao Y, Zhu T, Zhao J - Nanoscale Res Lett (2011)

Schematic illustration of the theoretical models.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211357&req=5

Figure 1: Schematic illustration of the theoretical models.
Mentions: It is also worth noting that the nanowires not only behave as intrinsic properties like bulk materials, but also have their special microcosmic behaviors due to nanoscale effects. In our previous work [25,26], the breaking uncertainty of the nanowire was found when the nanowire was stretched at different lengths and strain rates. The similar microscopic phenomena in experiments were also found in the metallic and the molecular junction conductance followed by a statistical distribution [27,28]. In our study, we designed different initial equilibrium states to investigate statistically the [100], [110], and [111] single-crystal copper nanowires. As shown in Figure 1, we propose a theoretical explanation for the relationship of micro-atomic fluctuation and macro-breaking position distribution based on symmetric stretching and structural anisotropy. We find micro-atomic fluctuation plays a critical role in the deformation of nanowires. At low strain rates, macro-breaking position distributions reflect anisotropic characters of the single-crystal nanowires, whereas the anisotropic characters behave unobvious at high strain rates because shocks induced by strong symmetric stretching dominate the breaking failure at two ends of the nanowires.

Bottom Line: The failure of the metallic nanowire has raised concerns due to its applied reliability in nanoelectromechanical system.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.However, when the strain rate is larger than 3.54% ps-1, the anisotropy is not obvious because of strong symmetric shocks.

View Article: PubMed Central - HTML - PubMed

Affiliation: Key Laboratory of Analytical Chemistry for Life Sciences, Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210008, P, R, China. zhaojw@nju.edu.cn.

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 0.26% ps-1, macro-breaking position distributions exhibit the anisotropy of micro-atomic fluctuation. However, when the strain rate is larger than 3.54% ps-1, the anisotropy is not obvious because of strong symmetric shocks.

No MeSH data available.


Related in: MedlinePlus