Metallic Tungsten Nanostructures and Highly Nanostructured Thin Films by Deposition of Tungsten Oxide and Subsequent Reduction in a Single Hot-Wire CVD Process

Authors

  • Peter-Paul R. M. L. Harks,

    1. Nanophotonics – Physics of Devices, Debye Institute for Nanomaterials Science, Utrecht University Princetonlaan 4, 3584 CB Utrecht (the Netherlands)
    Search for more papers by this author
  • Z. Silvester Houweling,

    Corresponding author
    1. Nanophotonics – Physics of Devices, Debye Institute for Nanomaterials Science, Utrecht University Princetonlaan 4, 3584 CB Utrecht (the Netherlands)
    • Nanophotonics – Physics of Devices, Debye Institute for Nanomaterials Science, Utrecht University Princetonlaan 4, 3584 CB Utrecht (the Netherlands)
    Search for more papers by this author
  • Michiel de Jong,

    1. Nanophotonics – Physics of Devices, Debye Institute for Nanomaterials Science, Utrecht University Princetonlaan 4, 3584 CB Utrecht (the Netherlands)
    Search for more papers by this author
  • Yinghuan Kuang,

    1. Nanophotonics – Physics of Devices, Debye Institute for Nanomaterials Science, Utrecht University Princetonlaan 4, 3584 CB Utrecht (the Netherlands)
    Search for more papers by this author
  • John W. Geus,

    1. Inorganic Chemistry and Catalysis, Electron Microscopy Utrecht, Utrecht University Padualaan 8, 3584 CH Utrecht (the Netherlands)
    Search for more papers by this author
  • Ruud E. I. Schropp

    Corresponding author
    1. Nanophotonics – Physics of Devices, Debye Institute for Nanomaterials Science, Utrecht University Princetonlaan 4, 3584 CB Utrecht (the Netherlands)
    • Nanophotonics – Physics of Devices, Debye Institute for Nanomaterials Science, Utrecht University Princetonlaan 4, 3584 CB Utrecht (the Netherlands)
    Search for more papers by this author

  • The authors acknowledge Hans Meeldijk for the TEM measurements. This project is undertaken with financial support from the Ministry of Economic Affairs of the Netherlands: program EOS (Subsidy Energy Research), NEO (New Energy Research).

Abstract

The synthesis of metallic tungsten nanostructures and highly nanostructured thin films is presented. Crystalline tungsten oxide nanostructures are deposited on glassy carbon substrates kept at 700 ± 100 °C by oxidizing resistively heated tungsten filaments in an air flow under subatmospheric pressures. The internal morphology of the deposited tungsten oxide can be reproducibly controlled by the air pressure. After deposition, the tungsten oxides have been fully reduced to metallic tungsten by atomic hydrogen at a temperature of about 730 °C. Polycrystalline metallic tungsten nanofibers, nanocrystallites, closed crystallite films, and nanogranular films are thus obtained in a single procedure involving deposition and subsequent reduction, at relatively low temperatures.

Ancillary