Reactive dc magnetron sputtering of W was performed in a plasma of Ar+O2 with and without CF4 addition and substrate bias. Structural studies by atomic force microscopy, X-ray diffraction, infrared reflectance spectroscopy, and Raman spectroscopy indicated that the electron e bombardment associated with a positive substrate bias led to grain growth and partial crystallization while maintaining a high density of W=O double bonds presumably on internal surfaces. Electrochemical measurements showed that the durability under extended Li+ intercalation/ deintercalation was excellent for e-bombarded oxide films and poor for oxyfluoride films. Spectrophotometric studies of the electrochromism yielded that the color/bleach dynamics was slow for the e-bombarded oxide but fast for the oxyfluoride. The range of optical modulation was large. Tandem films, with a thin protective layer of e-bombarded oxide covering a thicker oxyfluoride layer, were able to combine rapid dynamics with good durability.
Abstract. In this work TiO 2 -WO 3 composite films containing different oxide concentrations were prepared by electrophoretic deposition on steel substrates. Composite coating structures were analyzed by X -ray diffraction, Raman spectra and scanning electron microscopy. The results showed an even distribution of WO 3 particles in the entire composite layer. Light absorption measurements were used for photocatalytic properties evaluation. It was found that the removal ratio of methylene blue depends on the (TiO 2 ):(WO 3 ) concentration ratio. The most effective photodegradation was determined for the sample that was electrophoretically deposited from the suspension with the molar content ratio n(TiO 2 ):n(WO 3 ) 2:1.
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