Tungsten oxide (WO3) is one of the most promising materials for electrochromic devices and is currently investigated for applications in catalysis, ferroelectricity and in sensor technology. Here a molecular assembly approach to synthesize by sol–gel meso and macroporous thin films of tungsten oxide using polyethylene-glycol as a templating agent is reported. Micro-Raman spectroscopy has been employed to investigate the structure of WO3 thin films, deposited by dip-coating on glass, as a function of thermal annealing. This modified sol–gel route promotes the coexistence of a sub-stoichiometric monoclinic phase (most probably the WO2.72 phase) together with some hydrous phases (WO3·nH2O) even in samples heat treated up to 500 °C.
Micro-Raman Spectroscopy on polyethylene-glycol assisted Sol-Gel Meso and Macroporous WO3 Thin Films for Electrochromic Applications / A., Cremonesi; Y., Djaoued; Bersani, Danilo; Lottici, Pier Paolo. - In: THIN SOLID FILMS. - ISSN 0040-6090. - 516:(2008), pp. 4128-4132. [10.1016/j.tsf.2007.10.075]
Micro-Raman Spectroscopy on polyethylene-glycol assisted Sol-Gel Meso and Macroporous WO3 Thin Films for Electrochromic Applications
BERSANI, Danilo;LOTTICI, Pier Paolo
2008-01-01
Abstract
Tungsten oxide (WO3) is one of the most promising materials for electrochromic devices and is currently investigated for applications in catalysis, ferroelectricity and in sensor technology. Here a molecular assembly approach to synthesize by sol–gel meso and macroporous thin films of tungsten oxide using polyethylene-glycol as a templating agent is reported. Micro-Raman spectroscopy has been employed to investigate the structure of WO3 thin films, deposited by dip-coating on glass, as a function of thermal annealing. This modified sol–gel route promotes the coexistence of a sub-stoichiometric monoclinic phase (most probably the WO2.72 phase) together with some hydrous phases (WO3·nH2O) even in samples heat treated up to 500 °C.File | Dimensione | Formato | |
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