Dynamic Characterization of the Postbreaking Behavior of a Nanowire
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- 作者：Jianwei Zhao ; Kei Murakoshi ; Xing Yin ; Manabu Kiguchi ; Yan Guo ; Nan Wang ; Shuai Liang ; Hongmei Liu
- 刊名：Journal of Physical Chemistry C
- 出版年：2008
- 出版时间：December 18, 2008
- 年：2008
- 卷：112
- 期：50
- 页码：20088-20094
- 全文大小：385K
- 年卷期：v.112,no.50(December 18, 2008)
- ISSN：1932-7455
文摘
The dynamic evolution of a gold nanojunction has been investigated by incorporation of molecular dynamics (MD) simulation and mechanically controllable break junction (MCBJ) in a wide range of strain rates, covering nonequilibrium, quasi-equilibrium, and equilibrium tensile states. Theoretical simulations corresponding to the nonequilibrium and quasi-equilibrium states demonstrated that the metallic nanojunction spontaneously grew in the time scale of 1 ns. In the final stage, the gap increment revealed a unique stepwise feature, corresponding to the atomic-resolved tip reconstruction. When strain rate varied from 489.6 to 0.245 m/s, the gap was reduced from 4.0 to 1.3 nm. In the regime of equilibrium stretching, i.e., several nanometers per second, the experimental MCBJ results gave a mean gap size of 0.4 ± 0.1 nm, which showed less strain rate dependence. This value corresponded well to the absolute value of the stepwise increment of the gap due to the local tip recrystallization as estimated by the MD simulation. The agreement between theoretical modeling and experimental measurement demonstrates that the combination is a good strategy in nanoscience.