Oscillatory Mass Transport in Vapor-Liquid-Solid Growth of Sapphire Nanowires

被引：161

作者：

Oh, Sang Ho ^{[1
,2
]}

Chisholm, Matthew F. ^{[3
]}

Kauffmann, Yaron ^{[4
]}

Kaplan, Wayne D. ^{[4
]}

Luo, Weidong ^{[3
,5
]}

Ruehle, Manfred ^{[6
]}

Scheu, Christina ^{[7
,8
]}

机构：

[1] Pohang Univ Sci & Technol, Dept Mat Sci & Engn, Pohang 790784, South Korea

[2] Pohang Univ Sci & Technol, Natl Ctr Nanomat Technol, Pohang 790784, South Korea

[3] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

[4] Technion Israel Inst Technol, Dept Mat Engn, IL-32000 Haifa, Israel

[5] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

[6] Max Planck Inst Met Res, D-70569 Stuttgart, Germany

[7] Univ Munich, Dept Chem, D-81377 Munich, Germany

[8] Univ Munich, Ctr NanoSci, D-81377 Munich, Germany

来源：

SCIENCE | 2010年 / 330卷 / 6003期

关键词：

SURFACE-DIFFUSION; ALUMINUM; INTERFACES; TEMPERATURE; DYNAMICS;

D O I：

10.1126/science.1190596

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：489 / 493

页数：5

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