Journal
MATERIALS LETTERS
Volume 62, Issue 16, Pages 2297-2300Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2007.11.085
Keywords
selective etching; tungsten oxide hydrate; nanoplates; nanocomposites; optical materials and properties
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Tungsten oxide hydrate nanoplates with expanded surface area have been synthesized through the acid treatment of tungstate-aluminum keggin nanocomposite. According to powder X-ray diffraction and W L-m-edge X-ray absorption spectroscopic analyses, X-ray amorphous nanocomposite is changed into crystalline WO3 center dot 2H(2)O upon the acidic etching of alumina component. Nitrogen adsorption-desorption isotherm and field emission-scanning electron microscopy measurements clearly demonstrated that the surface area of the nanocomposite is increased by the selective etching of alumina component, a result of the formation of the porous stacking assembly of nanoplates. From optoelectrochernical analysis, the etched derivative is found to be applicable as an electrode material for electrochromic devices. Based on the experimental findings, we are able to conclude that the present selective etching method can provide a soft-chemical synthetic route to nanocrystalline metal oxides with expanded surface area. (c) 2007 Elsevier B.V. All rights reserved.
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