Mechanism of catalyst diffusion on magnesium oxide nanowire growth

Takeshi Yanagida, Kazuki Nagashima, Hidekazu Tanaka, Tomoji Kawai

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

In nanowire growth using vapor-liquid-solid (VLS) mechanism, controlling catalyst diffusion has been a key issue since VLS growth is essentially no longer feasible in the absence of catalyst on the tip. Here the authors demonstrate the controllability of catalyst diffusion on MgO nanowire growth by ambient pressure and discuss the underlying physical mechanism. Drastic enhancement of oxide nanowire growth was found when increasing the ambient pressure under oxygen atmosphere, and surprisingly even under argon atmosphere. This indicates that the ambient pressure rather than the amount of ambient oxygen dominates the oxide nanowire growth via suppressing the catalyst diffusion.

Original languageEnglish
Article number061502
JournalApplied Physics Letters
Volume91
Issue number6
DOIs
Publication statusPublished - 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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