Growth of metal oxide nanowires from supercooled liquid nanodroplets

Myung Hwa Kim, Byeongdu Lee, Sungsik Lee, Christopher Larson, Jeong Min Baik, Cafer T. Yavuz, Sönke Seifert, Stefan Vajda, Randall E. Winans, Martin Moskovits, Galen D. Stucky, Alec M. Wodtke

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

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 VO2, V2O5, RuO2, MoO2, MoO3, and Fe3O 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. © 2009 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)4138-4146
Number of pages9
JournalNano Letters
Volume9
Issue number12
DOIs
StatePublished - Dec 9 2009
Externally publishedYes

ASJC Scopus subject areas

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

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