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Shrinking nanowires by kinetically controlled electrooxidation.

M A Thompson1, E J Menke, C C Martens

  • 1Department of Chemistry and Institute for Surface and Interface Science, University of California, Irvine, California 92679-2025, USA.

The Journal of Physical Chemistry. B
|February 14, 2006
PubMed
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Researchers precisely controlled nanowire diameters using electrooxidation. This method allowed for uniform shrinking of antimony, gold, and bismuth telluride (Bi2Te3) nanowires, enabling precise diameter specification.

Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Nanowires are crucial in nanoscale electronics and sensors.
  • Controlling nanowire dimensions is essential for device performance.
  • Existing methods for nanowire diameter reduction can be imprecise or damaging.

Purpose of the Study:

  • To develop a precise method for reducing nanowire diameters.
  • To investigate the effects of electrooxidation on nanowire dimensions and integrity.
  • To integrate nanowire growth and shrinking into a single electrochemical process.

Main Methods:

  • Electrooxidation of antimony (Sb), gold (Au), and bismuth telluride (Bi2Te3) nanowires in aqueous solutions.
  • Controlled application of low current densities (Jox < 150 microA cm(-2)) to achieve kinetically controlled diameter reduction.

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  • Integration of electrochemical wire growth and electrooxidation shrinking within a single experiment.

    • Main Results:

    • Mean nanowire diameter decreased linearly with oxidation time at low current densities.
    • Nanowire diameter uniformity was maintained during shrinking from >120 nm down to <40 nm (Sb, Bi2Te3) or <60 nm (Au).
    • Continuous nanowires exceeding 100 micrometers were achieved; higher current densities caused breaks.

    Conclusions:

    • Electrooxidation offers a precise and controlled method for reducing nanowire diameters.
    • The process maintains diameter uniformity and nanowire integrity.
    • Integrated electrochemical growth and shrinking allows for fine-tuning of final nanowire dimensions with 5-10 nm precision.