Department of Materials Science and Engineering,University of Maryland, College Park, Maryland 20742, USA.
J Chem Phys. 2009 Nov 28;131(20):204703. doi: 10.1063/1.3254382.
Theoretical investigations of the growth and growth rates of single-crystal nanowires (NWs) by vapor phase mechanisms have been carried out. Substrate-induced processes are assumed to dominate this growth. The modeling for growth takes adsorption, desorption, surface scattering, and diffusion into account. It takes into consideration also the retarding electric field arising from the scattering of the NW vapor species by both the substrate and the NW sidewalls. Growth characteristics under the influence of the retarding electric field have been studied. Competitive roles of adatom diffusivity and the electric field in the NW growth are elucidated. Influence of the growing NW length and the adatom impingement rate on the NW growth rate has been described. The effect of adatom collection area around each NW has been examined. The NW tapering and kinking have been explained. The fundamentals of the substrate induction and details of the growth parameters have been analyzed. The influence of foreign element catalytic agents in the vapor-liquid-solid mechanism has been presented. All these have led to the understanding and resolution of problems, controversies, and contradictions involving substrate-induced NW growths.
已经对通过气相机制生长单晶纳米线（NWs）的生长和生长速率进行了理论研究。假设衬底诱导过程主导这种生长。该生长模型考虑了吸附、解吸、表面散射和扩散。它还考虑了由 NW 蒸气物种通过衬底和 NW 侧壁的散射引起的阻滞电场。研究了在阻滞电场影响下的生长特性。阐明了原子扩散率和电场在 NW 生长中的竞争作用。描述了生长中的 NW 长度和原子撞击率对 NW 生长速率的影响。研究了每个 NW 周围的原子收集面积的影响。解释了 NW 的变细和扭结。分析了衬底诱导的基本原理和生长参数的细节。提出了在气-液-固机制中外来元素催化剂的影响。所有这些都导致了对涉及衬底诱导 NW 生长的问题、争议和矛盾的理解和解决。
