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A supercritical carbon dioxide plasma process for preparing tungsten oxide nanowires
Ayato Kawashima1, Shinfuku Nomura, Hiromichi Toyota
1Department of Environmental Science for Industry, Faculty of Agriculture, Ehime University, 3-5-7 Tarumi Matsuyama, Ehime 790-8566, Japan. a-kawa@agr.ehime-u.ac.jp
Nanotechnology
|May 6, 2010
Summary
Researchers developed a supercritical carbon dioxide (CO(2)) plasma method to create tungsten oxide nanowires. These nanowires can be coated with amorphous carbon, forming a coaxial structure for potential applications.
Area of Science:
- Materials Science
- Nanotechnology
- Plasma Physics
Background:
- Fabrication of one-dimensional nanostructures is crucial for advanced materials.
- Tungsten oxide nanowires possess unique electronic and optical properties.
- Coating nanowires with carbon can enhance their stability and functionality.
Purpose of the Study:
- To present a novel supercritical carbon dioxide (CO(2)) plasma process.
- To fabricate one-dimensional tungsten oxide nanowires.
- To achieve amorphous carbon coating on these nanowires.
Main Methods:
- Utilized high-frequency plasma generated in supercritical carbon dioxide (20 MPa).
- Employed tungsten electrodes within a supercritical cell.
- Introduced an organic solvent with supercritical CO(2) into the plasma.
Main Results:
- Successfully produced tungsten oxide nanowires using the plasma process.
- Observed nanowires with and without an outer layer.
- Characterized coaxial structures with amorphous carbon outer layers (20-30 nm) and tungsten oxide inner layers (10-20 nm).
Conclusions:
- The supercritical CO(2) plasma process is effective for fabricating carbon-coated tungsten oxide nanowires.
- The process allows for controlled formation of coaxial nanostructures.
- This method offers a pathway for developing advanced nanomaterials with tailored properties.
