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Oscillatory Mass Transport in Vapor-Liquid-Solid Growth of Sapphire Nanowires
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Oscillatory Mass Transport in Vapor-Liquid-Solid Growth of Sapphire Nanowires
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Journal Article
Oscillatory Mass Transport in Vapor-Liquid-Solid Growth of Sapphire Nanowires
2010
Overview
In vapor-liquid-solid (VLS) growth, the liquid phase plays a pivotal role in mediating mass transport from the vapor source to the growth front of a nanowire. Such transport often takes place through the liquid phase. However, we observed by in situ transmission electron microscopy a different behavior for self-catalytic VLS growth of sapphire nanowires. The growth occurs in a layer-by-layer fashion and is accomplished by interfacial diffusion of oxygen through the ordered liquid aluminum atoms. Oscillatory growth and dissolution reactions at the top rim of the nanowires occur and supply the oxygen required to grow a new (0006) sapphire layer. A periodic modulation of the VLS triple-junction configuration accompanies these oscillatory reactions.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science
Subject
/ Atoms
/ Condensed matter: structure, mechanical and thermal properties
/ Cross-disciplinary physics: materials science; rheology
/ Diffusion in nanoscale solids
/ Exact sciences and technology
/ LIQUIDS
/ Nanoscale materials and structures: fabrication and characterization
/ NANOSCIENCE AND NANOTECHNOLOGY
/ OXYGEN
/ Physics
/ SAPPHIRE
/ Transmission electron microscopy
/ Transport properties of condensed matter (nonelectronic)
/ VAPORS
