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

10 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

Fingerprint

Nanowires
Heterojunctions
nanowires
Gases
vapor phases
Screw dislocations
synthesis
Chemical vapor deposition
routes
Flow rate
Thermodynamics
Decomposition
screw dislocations
flow velocity
adjusting
reactors
vapor deposition
tubes
decomposition
Temperature

All Science Journal Classification (ASJC) codes

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

Cite this

Choi, Yoo Youl ; Park, Si Jung ; Choi, Doo Jin. / Gas-phase synthesis and growth mechanism of SiC/SiO 2 core-shell nanowires. In: CrystEngComm. 2012 ; Vol. 14, No. 5. pp. 1737-1743.
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Gas-phase synthesis and growth mechanism of SiC/SiO 2 core-shell nanowires. / Choi, Yoo Youl; Park, Si Jung; Choi, Doo Jin.

In: CrystEngComm, Vol. 14, No. 5, 07.03.2012, p. 1737-1743.

Research output: Contribution to journalArticle

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