Truncated tetrahedron seed crystals initiating stereoaligned growth of FeSi nanowires

Si In Kim, Hana Yoon, Kwanyong Seo, Youngdong Yoo, Sungyul Lee, Bongsoo Kim

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We have synthesized epitaxially grown freestanding FeSi nanowires (NWs) on an m-Al 2O 3 substrate by using a catalyst-free chemical vapor transport method. FeSi NW growth is initiated from FeSi nanocrystals, formed on a substrate in a characteristic shape with a specific orientation. Cross-section TEM analysis of seed crystals reveals the crystallographic structure and hidden geometry of the seeds. Close correlation of geometrical shapes and orientations of the observed nanocrystals with those of as-grown NWs indicates that directional growth of NWs is initiated from the epitaxially formed seed crystals. The diameter of NWs can be controlled by adjusting the composition of Si in a Si/C mixture. The epitaxial growth method for FeSi NWs via seed crystals could be employed to heteroepitaxial growth of other compound NWs.

Original languageEnglish (US)
Pages (from-to)8652-8657
Number of pages6
JournalACS nano
Volume6
Issue number10
DOIs
StatePublished - Oct 23 2012

Keywords

  • epitaxial growth
  • iron silicide
  • nanowires
  • seed crystal
  • transition metal silicides

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