Direct Fabrication of Zero- and One-Dimensional Metal Nanocrystals by Thermally Assisted Electromigration

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• 作者：Jong Min Yuk ; Kwanpyo Kim ; Zonghoon Lee ; Masashi Watanabe ; A. Zettl ; Tae Whan Kim ; Young Soo No ; Won Kook Choi ; Jeong Yong Lee
• 刊名：ACS Nano
• 出版年：2010
• 出版时间：June 22, 2010
• 年：2010
• 卷：4
• 期：6
• 页码：2999-3004
• 全文大小：301K
• 年卷期：0
• ISSN：1936-086X

文摘

Zero- and one-dimensional metal nanocrystals were successfully fabricated with accurate control in size, shape, and position on semiconductor surfaces by using a novel in situ fabrication method of the nanocrystal with a biasing tungsten tip in transmission electron microscopy. The dominant mechanism of nanocrystal formation was identified mainly as local Joule heating-assisted electromigration through the direct observation of formation and growth processes of the nanocrystal. This method was applied to extracting metal atoms with an exceedingly faster growth rate (∼10⁵ atoms/s) from a metal-oxide thin film to form a metal nanocrystal with any desired size and position. By real-time observation of the microstructure and concurrent electrical measurements, it was found that the nanostructure formation can be completely controlled into various shapes such as zero-dimensional nanodots and one-dimensional nanowires/nanorods.