Steering epitaxial alignment of Au, Pd, and AuPd nanowire arrays by atom flux change.
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.
Yoo
Youngdong
Y
Department of Chemistry, KAIST, Daejeon 305-701, Korea.
Seo
Kwanyong
K
Han
Sol
S
Varadwaj
Kumar S K
KS
Kim
Hyun You
HY
Ryu
Ji Hoon
JH
Lee
Hyuck Mo
HM
Ahn
Jae Pyoung
JP
Ihee
Hyotcherl
H
Kim
Bongsoo
B
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*
D010165:Palladium; D006046:Gold; D000537:Aluminum Oxide