Fabrication of WO_3 Nanoflakes by a Dealloying-based Approach
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We demonstrate the fabrication of WO<SUB>3</SUB> nanoflakes by dealloying with subsequent thermal oxidation. Sputtered amorphous W<SUB>0.68</SUB>Cu<SUB>0.32</SUB> alloy films were dealloyed in HNO<SUB>3</SUB> solution where Cu was selectively removed and W self-assembled into cross-linked cubic phase W nanoflakes. This kind of W nanoflakes was transformed to monoclinic WO<SUB>3</SUB> nanoflakes by thermal oxidation at 500 °C. Gas sensor made using the WO<SUB>3</SUB> nanoflakes showed promising NO<SUB>2</SUB>-sensing performance.
- Chemistry Letters
Chemistry Letters 37(3), 296-297, 2008-03-05
The Chemical Society of Japan