Grafting mechanism of electrochromic PAA-WO{sub 3} composite film
- Seoul National Univ. (Korea, Republic of)
- Univ. de Bordeaux 1, Pessac (France). Inst. de Chimie de la Matiere Condensee
- Univ. de Bordeaux 1, Talence (France). Lab. de Spectroscopie Moleculaire et Cristalline
A micro-Raman spectroscopic study has been carried out to investigate the electrochromic process in a porous and nanocrystalline tungsten oxide film. The film was prepared by dipping the tin-doped indium oxide glass into an aqueous mixture solution of PAA (polyacrylic acid) and WO{sub 3}-NH{sub 4}OH. After heating at low temperature, around 100 C, the film was treated in 1 N HCl in order to achieve polycondensation, where the ammonium ion was replaced with a proton. In the micro-Raman spectra for the bleached and colored PAA-WO{sub 3} films, it was evident that the coloration accompanies a peak reduction at {approximately}960 cm{sup {minus}1} and a peak enhancement at {approximately}810 cm{sup {minus}1}. Based upon the present Raman observation, the authors can confirm that the electrochromism of the nanocrystalline tungsten oxide is dominated by the grafting process, i.e., the surface modification of {single_bond}W{sup VI}{double_bond}O bonds into {single_bond}W{sup V}{double_bond}O{sup (1{minus}{delta})+}{emdash}M{sup {delta}+} (M = H, Li) ones.
- OSTI ID:
- 329185
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 142; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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