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Two Synthetic Routes to The Formation of Tungsten Oxide Hybrid Compounds

Published online by Cambridge University Press:  01 February 2011

S.V. Chong ,
B. Ingham  and
J.L. Tallon
S.V. Chong
Affiliation:
Industrial Research Limited, P.O. Box 31 310, Lower Hutt 6009, New Zealand
B. Ingham
Affiliation:
Victoria University of Wellington, P.O. Box 600, Wellington 6005, New Zealand
J.L. Tallon
Affiliation:
Industrial Research Limited, P.O. Box 31 310, Lower Hutt 6009, New Zealand Victoria University of Wellington, P.O. Box 600, Wellington 6005, New Zealand
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Abstract

The syntheses of tungsten oxide-organic amine hybrids via homogenous and heterogeneous routes were explored and compared. In the former case, tungstic acid (H2WO4) and an appropriate amine were dissolved in ammonia solution under nitrogen atmosphere, and the product was precipitated out via evaporation of the solvent. In heterogeneous synthesis, a non-aqueous approach was employed in which H2WO4 powder was aged in a solution consisting of the amine dissolved in an appropriate organic solvent. XRD and FTIR showed that the hybrid materials obtained from the two different methods are identical. Based on these findings, we were able to prepare tungsten oxide hybrid films for the first time, by dip-coating tungstic acid films prepared from sol-gel techniques, in a non-aqueous diamine solution. The XRD spectra of these films exhibit a series of harmonic peaks, indexed as [00k ], which correspond to the Bragg peaks for the hybrid compounds. SEM shows the morphology of tungstic acid changes from the irregularly shaped platelets to a needle-like structure of the hybrids and resulted in a loosely packed coating.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 847: Symposium EE – Organic/Inorganic Hybrid Materials , 2004 , EE13.14
Copyright
Copyright © Materials Research Society 2005

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