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Baik, Jeong Min
Nano Energy and Environmental Materials Lab
Research Interests
  • Nanogenerators, antimicrobial material, catalysis, smart sensors

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Growth of Metal Oxide Nanowires from Supercooled Liquid Nanodroplets

Cited 33 times inthomson ciCited 29 times inthomson ci
Title
Growth of Metal Oxide Nanowires from Supercooled Liquid Nanodroplets
Author
Kim, Myung HwaLee, ByeongduLee, SungsikLarson, ChristopherBaik, Jeong MinYavuz, Cafer T.Seifert, SSeifert, SoenkeVajda, StefanWinans, Randall E.Moskovits, MartinStucky, GDWodtke, Alec M
Keywords
Bulk melting; Crystalline metals; Gi-SAXS; Grazing incidence small-angle X-ray scattering; In-situ; Liquid droplets; Metal oxide nanowires; Nanodroplet; Nanowire growth; Nanowire lattices; New mechanisms; Quantitative information; Simple approach; Supercooled liquids; Wetting force
Issue Date
2009-12
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.9, no.12, pp.4138 - 4146
Abstract
Nanometer-sized liquid droplets formed at temperatures below the bulk melting point become supercooled as they grow through Ostwald ripening or coalescence and can be exploited to grow nanowires without any catalyst. We used this simple approach to synthesize a number of highly crystalline metal oxide nanowires in a chemical or physical vapor deposition apparatus. Examples of nanowires made in this way include VO(2), V(2)O(5), RuO(2), MoO(2), MoO(3), and Fe(3)O(4), some of which have not been previously reported. Direct evidence of this new mechanism of nanowire growth is found from in situ 2-dimensional GISAXS (grazing incidence small angle X-ray scattering) measurements Of VO(2) nanowire growth, which provides quantitative information on the shapes and sizes of growing nanowires as well as direct evidence of the presence of supercooled liquid droplets. We observe dramatic changes in nanowire growth by varying the choice of substrate, reflecting the influence of wetting forces on the supercooled nanodroplet shape and mobility as well as substrate-nanowire lattice matching on the definition of nanowire orientation. Surfaces with defects can also be used to pattern the growth of the nanowires. The simplicity of this synthesis concept suggests it may be rather general in its application.
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DOI
10.1021/nl902357q
ISSN
1530-6984
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