Title
Phase selection enabled formation of abrupt axial heterojunctions in branched oxide nanowires Phase selection enabled formation of abrupt axial heterojunctions in branched oxide nanowires
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Washington
Subject
Physics
Chemistry
Source (journal)
Nano letters / American Chemical Society. - Washington
Volume/pages
12(2012) :1 , p. 275-280
ISSN
1530-6984
ISI
000298943100048
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Rational synthesis of nanowires via the vaporliquidsolid (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 AuCu alloys as catalyst. Furthermore, we demonstrate that VLS synthesis gives unprecedented freedom to navigate the ternary InSnO 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.
E-info
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