Reactive diffusion and stresses in nanowires or nanorods
Reactive diffusion and stresses in nanowires or nanorods
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DOI：
10.1016/j.actamat.2017.04.001
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发表时间：
2017-06
期刊：
影响因子：
9.4
通讯作者：
M. Roussel;Z. Erdélyi;G. Schmitz
中科院分区：
文献类型：
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作者：
M. Roussel;Z. Erdélyi;G. Schmitz
异质结构纳米线是当今场效应管、场发射体、电池和太阳能电池等技术的主要研究方向。我们考虑了它们的老化行为，建立了一个关注核壳纳米线中反应扩散的模型。提出了一套完整的考虑热力学驱动力、空位分布、弹性应力及其塑性松弛的解析方程。这种对反应扩散的完整描述可用于有限元模拟，以研究各种几何形状的扩散过程。为了清楚地显示柱状几何、反应扩散和纳米线中的应力之间的相互作用，我们研究了不同核-壳几何结构中金属间反应产物的形成。重点展示了如何通过在纳米线上施加轴向应力来控制反应的动力学。
Heterostructured nanowires are of prime interest in nowadays technology such as field-effect transistors, field emitters, batteries and solar cells. We consider their aging behavior and developed a model focusing on reactive diffusion in core-shell nanowires. A complete set of analytical equations is presented that takes into account thermodynamic driving forces, vacancy distribution, elastic stress and its plastic relaxation. This complete description of the reactive diffusion can be used in finite element simulations to investigate diffusion processes in various geometries. In order to show clearly the interplay between the cylindrical geometry, the reactive diffusion and the stresses developing in the nanowire, we investigate the formation of an intermetallic reaction product in various core-shell geometries. Emphasis is placed on showing how it is possible to control the kinetics of the reaction by applying an axial stress to the nanowires.