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Crystallographically Oriented Mesoporous WO<sub>3</sub> Films: Synthesis, Characterization, and Applications

Clara SantatoContribution from the Department of Chemistry, University of Geneva, CH-1211 Geneva 4, SwitzerlandMarek OdziemkowskiContribution from the Department of Chemistry, University of Geneva, CH-1211 Geneva 4, SwitzerlandM. UlmannContribution from the Department of Chemistry, University of Geneva, CH-1211 Geneva 4, SwitzerlandJan AugustyńskiContribution from the Department of Chemistry, University of Geneva, CH-1211 Geneva 4, Switzerland

2001en

ABI

Annotatsiya

Mesoporous semiconducting films consisting of preferentially orientated monoclinic-phase nanocrystals of tungsten trioxide have been prepared using a novel version of the sol-gel method. Transformations undergone by a colloidal solution of tungstic acid, stabilized by an organic additive such as poly(ethylene glycol) (PEG) 300, as a function of the annealing temperature have been followed by means of a confocal Raman microscope. The shape and size of WO3 nanoparticles, the porosity, and the properties of the films depend critically on preparation parameters, such as the tungstic acid/PEG ratio, the PEG chain length, and the annealing conditions. Well-crystallized WO3 films combine excellent photoresponse to the blue region of the solar spectrum, up to 500 nm, with good transparency at wavelengths larger than 550 nm. Particular applications of these nanocrystalline WO3 films include photoelectrochemical and electrochromic devices.

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Identifikatorlar

DOI: 10.1021/ja011315x

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