Direct Fabrication of Zero- and One-Dimensional Metal Nanocrystals by Thermally Assisted Electromigration
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- Direct Fabrication of Zero- and One-Dimensional Metal Nanocrystals by Thermally Assisted Electromigration
- Yuk, Jong Min; Kim, Kwanpyo; Lee, Zonghoon; Watanabe, Masashi; Zettl, A.; Kim, Tae Whan; No, Young Soo; Choi, Won Kook; Lee, Jeong Yong
- Electromigration; In situ nanofabrication; In situ transmission electron microscopy; Joule heating; Metal; Nanodots; Nanorods; Nanostructures; Nanowires; Scanning probe
- Issue Date
- AMER CHEMICAL SOC
- ACS NANO, v.4, no.6, pp.2999 - 3004
- 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.
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