title: Steering epitaxial alignment of Au, Pd, and AuPd nanowire arrays by atom flux change.
abstract: We have synthesized epitaxial Au, Pd, and AuPd nanowire arrays in vertical or horizontal alignment on a c-cut sapphire substrate. We show that the vertical and horizontal nanowire arrays grow from half-octahedral seeds by the correlations of the geometry and orientation of seed crystals with those of as-grown nanowires. The alignment of nanowires can be steered by changing the atom flux. At low atom deposition flux vertical nanowires grow, while at high atom flux horizontal nanowires grow. Similar vertical/horizontal epitaxial growth is also demonstrated on SrTiO(3) substrates. This orientation-steering mechanism is visualized by molecular dynamics simulations.
authors.affiliation: Department of Chemistry, KAIST, Daejeon 305-701, Korea.
authors.forename: Youngdong
authors.initials: Y
authors.lastname: Yoo
authors.forename: Kwanyong
authors.initials: K
authors.lastname: Seo
authors.forename: Sol
authors.initials: S
authors.lastname: Han
authors.forename: Kumar S K
authors.initials: KS
authors.lastname: Varadwaj
authors.forename: Hyun You
authors.initials: HY
authors.lastname: Kim
authors.forename: Ji Hoon
authors.initials: JH
authors.lastname: Ryu
authors.forename: Hyuck Mo
authors.initials: HM
authors.lastname: Lee
authors.forename: Jae Pyoung
authors.initials: JP
authors.lastname: Ahn
authors.forename: Hyotcherl
authors.initials: H
authors.lastname: Ihee
authors.forename: Bongsoo
authors.initials: B
authors.lastname: Kim
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D003460:Crystallization; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning / Q000379:methods; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry; D053770:Nanowires / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*
chemical_list: D010165:Palladium; D006046:Gold; D000537:Aluminum Oxide