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Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition
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Oriented single crystalline titanium dioxide nanowires.

B Liu1, J E Boercker, E S Aydil

  • 1Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, MN 55455, USA.

Nanotechnology
|November 28, 2009
PubMed
Summary
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We synthesized oriented single crystal titanium dioxide (TiO2) nanowire arrays on titanium foil. These arrays show potential for enhancing photocatalytic and photovoltaic devices.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Inorganic Chemistry

Background:

  • Titanium dioxide (TiO2) is a crucial material in photocatalysis and photovoltaics.
  • Developing oriented single crystalline TiO2 nanostructures is key to improving device efficiency.
  • Existing methods often lack control over crystal orientation and morphology.

Purpose of the Study:

  • To develop a novel synthesis route for oriented single crystalline TiO2 nanowire arrays.
  • To explore the potential applications of these nanowire arrays in advanced devices.
  • To establish a method for creating hierarchical nanostructures using TiO2 nanowires as templates.

Main Methods:

  • Alkali hydrothermal growth of single crystal sodium titanate (Na2Ti2O5·H2O) nanowires on titanium foil.

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  • Ion-exchange reaction to convert Na2Ti2O5·H2O to protonated bititanate (H2Ti2O5·H2O) nanowires.
  • Topotactic transformation via calcination to yield single crystalline anatase TiO2 nanowires.

    • Main Results:

    • Successfully synthesized oriented single crystalline TiO2 nanowire arrays (2-50 microm long) on titanium foil.
    • Nanowires are primarily oriented normal to the substrate in the [100] direction.
    • Demonstrated the ability to grow even longer nanowires and use them as templates for hierarchical nanostructures.

    Conclusions:

    • The developed three-step synthesis method provides controlled growth of oriented single crystalline TiO2 nanowires.
    • These nanowire arrays on flexible titanium substrates offer promising applications in photocatalysis and photovoltaics, potentially enhancing electron transport.
    • The TiO2 nanowires serve as versatile templates for fabricating complex nanostructures.