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A room temperature etching route to tungsten oxide hydrate nanoplates with expanded surface area

Title
A room temperature etching route to tungsten oxide hydrate nanoplates with expanded surface area
Authors
Han A.R.Hwang S.-J.Jung H.Choy J.-H.
Ewha Authors
최진호황성주
SCOPUS Author ID
최진호scopus; 황성주scopus
Issue Date
2008
Journal Title
Materials Letters
ISSN
0167-577XJCR Link
Citation
vol. 62, no. 15, pp. 2297 - 2300
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
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 LIII-edge X-ray absorption spectroscopic analyses, X-ray amorphous nanocomposite is changed into crystalline WO3·2H2O 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 optoelectrochemical 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. © 2007 Elsevier B.V. All rights reserved.
DOI
10.1016/j.matlet.2007.11.085
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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