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Title: Ethanol-promoted fabrication of tungsten oxide nanobelts with defined crystal orientation
Authors: Suphaporn Daothong
Naratip Songmee
Nuchjira Dejang
Thomas Pichler
Hidetsugu Shiozawa
Yan Jia
David Batchelor
Esko Kauppinen
Somchai Thongtem
Paola Ayala
Pisith Singjai
Keywords: Chemistry
Materials Science
Issue Date: 14-Jan-2010
Abstract: A controlled method for the production of tungsten oxide nanobelts through metal oxidation in presence of ethanol is proposed. At the optimal synthesis conditions, up to 20 μm long vertically aligned ribbon-like structures with a narrow rectangular cross section can be obtained in a tuned manner with preferential formation of WO2in the presence of graphitic like carbon. Bulk and local-scale studies suggest that carbon diffusion to the surface of the material leads to the formation of mainly WO3nanobelts from simple annealing treatments at 450 °C. This represents one alternative method to the common tungsten oxidation in air, opening the possibility to use C-containing compounds with negligible formation of carbide traces. An in-depth characterization of these materials has been performed, and the possible growth mechanisms are here discussed. © 2010 American Chemical Society.
ISSN: 19327455
Appears in Collections:CMUL: Journal Articles

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