Steering epitaxial alignment of Au, Pd, and AuPd nanowire arrays by atom flux change

Youngdong Yoo, Kwanyong Seo, Sol Han, Kumar S K Varadwaj, Hyun You Kim, Ji Hoon Ryu, Hyuck Mo Lee, Jae Pyoung Ahn, Hyotcherl Ihee, Bongsoo Kim

Research output: Contribution to journalArticlepeer-review

88 Scopus citations

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 SrTiO3 substrates. This orientation-steering mechanism is visualized by molecular dynamics simulations.

Original languageEnglish (US)
Pages (from-to)432-438
Number of pages7
JournalNano letters
Volume10
Issue number2
DOIs
StatePublished - Feb 10 2010

Keywords

  • Epitaxial growth
  • Gold
  • Nanowire
  • Palladium
  • Seed crystal

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