Gas-phase synthesis and growth mechanism of SiC/SiO 2 core-shell nanowires

Yoo Youl Choi, Si Jung Park, Doo Jin Choi

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

A simple, non-catalytic synthetic route for SiC/SiO 2 core-shell heterostructure nanowires (SiC/SiO 2 NWs) is presented, which involves establishment of separate regions for source gas decomposition and NW deposition in a chemical vapour deposition tube reactor. The O 2 flow rate controlled the NW diameter, which could be varied in the range 30-490 nm, and also allowed adjustment of the core-shell diameter ratio. The NW length directly increased with deposition time. The SiC core possessed a smooth spiral structure that grew in the [111] direction via a screw dislocation mechanism. The factors determining the core-shell diameter ratio, predominant species in each temperature region, and sequence of SiO 2 shell formation were identified by thermodynamic calculations. We expect this new simple synthetic route to be useful in producing other heterostructure materials with compositional ordering.

Original languageEnglish
Pages (from-to)1737-1743
Number of pages7
JournalCrystEngComm
Volume14
Issue number5
DOIs
Publication statusPublished - 2012 Mar 7

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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