title: Direct fabrication of zero- and one-dimensional metal nanocrystals by thermally assisted electromigration.
abstract: 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 ( approximately 10(5) 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.
authors.affiliation: Department of Materials Science and Engineering, KAIST, Daejeon 305-701, Korea.
authors.forename: Jong Min
authors.initials: JM
authors.lastname: Yuk
authors.forename: Kwanpyo
authors.initials: K
authors.lastname: Kim
authors.forename: Zonghoon
authors.initials: Z
authors.lastname: Lee
authors.forename: Masashi
authors.initials: M
authors.lastname: Watanabe
authors.forename: A
authors.initials: A
authors.lastname: Zettl
authors.forename: Tae Whan
authors.initials: TW
authors.lastname: Kim
authors.forename: Young Soo
authors.initials: YS
authors.lastname: No
authors.forename: Won Kook
authors.initials: WK
authors.lastname: Choi
authors.forename: Jeong Yong
authors.initials: JY
authors.lastname: Lee
mesh_terms: D003460:Crystallization / Q000379:methods*; D004595:Electroplating / Q000379:methods*; D006358:Hot Temperature; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008670:Metals / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission / Q000379:methods*; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D008670:Metals