电流作用下铁纳米晶在碳纳米管中的表面运动
Surface Atom Motion to Move Iron Nanocrystals through Constrictions in Carbon Nanotubes under the Action of an Electric Current
摘要：
在电流的作用下，碳纳米管内部的金属纳米晶体可以被整体传输。我们从实验和理论上研究了铁纳米管如何通过比纳米管本身横截面积更小的碳纳米管收缩。值得注意的是，通过原位透射电子成像和衍射，我们发现，当通过收缩时，碳纳米管在很大程度上保持固体和结晶，而碳纳米管不受影响。我们解释了这种行为的铁原子的运动和重排的表面上的铁原子的图案。可以用一个模型来描述微电极的运动，该模型的参数几乎与微电极的长度、面积、温度和电迁移力的大小无关。我们预测，金属纳米晶体可以通过复杂的几何形状和收缩，与纳米力学和金属纳米粒子的可调合成的影响。
英文摘要：
Under the application of electrical currents, metal nanocrystals inside carbon nanotubes can be bodily transported. We examine experimentally and theoretically how an iron nanocrystal can pass through a constriction in the carbon nanotube with a smaller cross-sectional area than the nanocrystal itself. Remarkably, through in situ transmission electron imaging and diffraction, we find that, while passing through a constriction, the nanocrystal remains largely solid and crystalline and the carbon nanotube is unaffected. We account for this behavior by a pattern of iron atom motion and rearrangement on the surface of the nanocrystal. The nanocrystal motion can be described with a model whose parameters are nearly independent of the nanocrystal length, area, temperature, and electromigration force magnitude. We predict that metal nanocrystals can move through complex geometries and constrictions, with implications for both nanomechanics and tunable synthesis of metal nanoparticles.
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