Structure-dependent growth control in nanowire synthesis via on-film formation of nanowires

Wooyoung Shim, Jinhee Ham, Jin Seo Noh, Wooyoung Lee

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

On-film formation of nanowires, termed OFF-ON, is a novel synthetic approach that produces high-quality, single-crystalline nanowires of interest. This versatile method utilizes stress-induced atomic mass flow along grain boundaries in the polycrystalline film to form nanowires. Consequently, controlling the magnitude of the stress induced in the films and the microstructure of the films is important in OFF-ON. In this study, we investigated various experimental growth parameters such as deposition rate, deposition area, and substrate structure which modulate the microstructure and the magnitude of stress in the films, and thus significantly affect the nanowire density. We found that Bi nanowire growth is favored in thermodynamically unstable films that facilitate atomic mass flow during annealing. A large film area and a large thermal expansion coefficient mismatch between the film and the substrate were found to be critical for inducing large compressive stress in a film, which promotes Bi nanowire growth. The OFF-ON method can be routinely used to grow nanowires from a variety of materials by tuning the material-dependent growth parameters.

Original languageEnglish
Article number196
JournalNanoscale Research Letters
Volume6
Issue number1
DOIs
Publication statusPublished - 2011 Jan

Bibliographical note

Funding Information:
This study was supported by the Priority Research Centers Program (2009-0093823) through the National Research Foundation of Korea (NRF), and by a grant from the Fundamental R&D Program for the Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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