纳米棒生长过程中的原子机制和直径选择
Atomistic mechanisms and diameter selection during nanorod growth
摘要：
本文研究了纳米棒生长的原子机制，提出了纳米棒直径选择的方法。一个特征半径被证明是至关重要的纳米棒的生长，这增加成正比的单层步骤的沉积速率的层间跳跃率的比率的五分之一的权力。当初始岛的半径大于该特征半径时，经过过渡层后，生长形态由类锥形结构演变为半径等于特征半径的纳米棒。否则，纳米棒的形态可以保持在生长过程中，与稳定的半径是有限的初始岛的半径和三维Ehrlich-Schwoebel势垒。因此，可以通过调节特征半径来选择不同的生长模式和纳米棒的直径。理论预测与ZnO生长的实验观察结果吻合得很好。
英文摘要：
We study in this paper the atomic mechanisms of nanorod growth and propose the way of diameter selection of nanorod. A characteristic radius is demonstrated to be crucial in nanorod growth, which increases proportional to one fifth power of the ratio of the interlayer hopping rate of adatoms across the monolayer steps to the deposition rate. When the radius of the initial island is larger than this characteristic radius, the growth morphology evolves from a taper-like structure to a nanorod with radius equal to the characteristic radius after some transient layers. Otherwise the nanorod morphology can be maintained during the growth, with stable radius being limited by both the radius of the initial island and the three-dimensional Ehrlich-Schwoebel barrier. Therefore different growth modes and diameter of nanorod can be selected by tuning the characteristic radius. The theoretical predictions are in good agreement with experimental observations of ZnO growth.
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