Journal
NANO LETTERS
Volume 10, Issue 2, Pages 432-438Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl903002x
Keywords
Gold; palladium; nanowire; epitaxial growth; seed crystal
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Funding
- NRF [20090083138]
- Nano Research and Development (RD) program [20090083221]
- Center for Nanostructured Materials Technology [2009K000468]
- Korea Institute of Industrial Technology(KITECH) [B0009787] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Ministry of Education, Science & Technology (MoST), Republic of Korea [KIOST] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [15-2008-07-001-00, 2007-0056784, 2008-2000075, 2006-311-C00340] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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