Phase Selection Enabled Formation of Abrupt Axial Heterojunctions in Branched Oxide Nanowires
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- 作者：Jing Gao ; Oleg I. Lebedev ; Stuart Turner ; Yong Feng Li ; Yun Hao Lu ; Yuan Ping Feng ; Philippe Boullay ; Wilfrid Prellier ; Gustaaf van Tendeloo ; Tom Wu
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：January 11, 2012
- 年：2012
- 卷：12
- 期：1
- 页码：275-280
- 全文大小：376K
- 年卷期：v.12,no.1(January 11, 2012)
- ISSN：1530-6992
文摘
Rational synthesis of nanowires via the vapor鈥搇iquid鈥搒olid (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鈥揅u alloys as catalyst. Furthermore, we demonstrate that VLS synthesis gives unprecedented freedom to navigate the ternary In鈥揝n鈥揙 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.