Acoustic Enhancement of Surface Diffusion

Acoustic Enhancement of Surface Diffusion
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表面扩散的声学增强

DOI:
10.1021/jp400884d
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发表时间:
2013
影响因子:
3.7
通讯作者:
L. Zhigilei
L. Zhigilei
中科院分区:
化学3区
文献类型:
--
作者:
Chengping Wu;V. Zaitsev;L. Zhigilei

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声激活的表面扩散的想法进行了理论探讨和原子模拟。结果表明,表面声波的扩散增强作用主要是通过(1)瞬态表面应变引起的扩散势垒的改变,(2)表面温度的绝热变化,以及(3)声波与吸附物质振动态的动态耦合。建立了描述前两种效应的近似标度律,并在动力学Monte Carlo模拟中进行了验证。在分子动力学模拟中研究了所有三种效应的综合贡献,并阐明了通过动态耦合进行扩散活化的条件。表面扩散的声学增强为热敏衬底上的薄膜生长提供了一种有吸引力的热激活替代方案。
The idea of acoustic activation of surface diffusion is explored theoretically and in atomistic simulations. It is found that a substantial diffusion enhancement by surface acoustic waves is possible via (1) transient surface strain-induced modification of the diffusion barriers, (2) adiabatic variation in the surface temperature, and (3) dynamic coupling of the acoustic waves with vibrational states of adsorbed species. The approximate scaling laws describing the first two effects are established and verified in kinetic Monte Carlo simulations. The combined contribution of all three effects is studied in molecular dynamics simulations, and the conditions for the diffusion activation through the dynamic coupling are elucidated. The acoustic enhancement of surface diffusion provides an attractive alternative to thermal activation in thin film growth on heat-sensitive substrates.
声波对催化的影响
DOI: --
发表时间: 2010
期刊:
影响因子: --
作者:
野々村拓;小嶋亮次;福本浩章;大山聖;藤井孝蔵;井上泰宣
通讯作者: 井上泰宣