Phase selection enabled formation of abrupt axial heterojunctions in branched oxide nanowires

Jing Gao, Oleg I. Lebedev, Stuart Turner, Yong Feng Li, Yun Hao Lu, Yuan Ping Feng, Philippe Boullay, Wilfrid Prellier, Gustaaf Van Tendeloo, Tao Wu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Rational synthesis of nanowires via the vapor-liquid-solid (VLS) mechanism with compositional and structural controls is vitally important for fabricating functional nanodevices from bottom up. Here, we show that branched indium tin oxide nanowires can be in situ seeded in vapor transport growth using tailored Au-Cu alloys as catalyst. Furthermore, we demonstrate that VLS synthesis gives unprecedented freedom to navigate the ternary In-Sn-O phase diagram, and a rare and bulk-unstable cubic phase can be selectively stabilized in nanowires. The stabilized cubic fluorite phase possesses an unusual almost equimolar concentration of In and Sn, forming a defect-free epitaxial interface with the conventional bixbyite phase of tin-doped indium oxide that is the most employed transparent conducting oxide. This rational methodology of selecting phases and making abrupt axial heterojunctions in nanowires presents advantages over the conventional synthesis routes, promising novel composition-modulated nanomaterials.

Original languageEnglish (US)
Pages (from-to)275-280
Number of pages6
JournalNano Letters
Volume12
Issue number1
DOIs
StatePublished - Jan 11 2012

Keywords

  • Vapor-liquid-solid growth
  • branched nanowire
  • heterojunction
  • indium tin oxide
  • phase selection

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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