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Periodically twinned nanowires and polytypic nanobelts of ZnS: The role of mass diffusion in vapor-liquid-solid growth

Hao, Yufeng and Meng, Guowen and Wang, Zhong Lin and Ye, Changhui and Zhang, Lide (2006) Periodically twinned nanowires and polytypic nanobelts of ZnS: The role of mass diffusion in vapor-liquid-solid growth. NANO LETTERS, 6 (8). pp. 1650-1655.

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Official URL: http://www.nanoscience.gatech.edu/zlwang/paper/200...

Abstract

There are two mass diffusion processes regarding the vapor-liquid-solid (VLS) growth of nanostructures: one is inside the catalyst droplet toward the liquid-solid interface; the other is along the side surface planes of the growing nanostructures. In this letter, microscale, modulated mass diffusion scenarios are exhibited through the synthesis of two types of ZnS nanostructures in an Au-catalyzed VLS process: periodically twinned nanowires originated from periodical fluctuation between diffusion rate inside the catalytic droplet and the growth rate on the liquid solid interface; the formation of asymmetrically polytypic nanobelts is related to one certain side surface bounded by high surface-energy plane, which serves as a preferential diffusion direction of reactant adatoms. The results may have important impact on the understanding of the physical and chemical process of the VLS mechanism. These longitudinally and latitudinally tunable crystalline structures enrich the family of one-dimensional nano-building blocks, and may find potential applications in nanotechnology.

Item Type:Article
Subjects:Material Science > Nanofabrication processes and tools
Material Science > Nanostructured materials
ID Code:2757
Deposited By:Lesley Tobin
Deposited On:16 Jan 2009 17:01
Last Modified:16 Jan 2009 17:01

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