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EnglishA new sol-gel synthesis based on chloride compounds as precursors has been used to prepare bismuth titanate (BT) films. The films have been deposited by dip-coating and fired at different temperatures in air; they remain amorphous up to 500 degrees C, and crystallize into the pyrochloric cubic phase Bi(2)Ti(2)O(7) between 600 degrees and 700 degrees C while at higher temperatures of firing the stable Bi(2)Ti(4)O(11) monoclinic phase is formed. The films have been characterized by X-ray diffraction analysis at gracing incidence, X-ray photoelectron spectroscopy, ellipsometric spectroscopy, UV-visible absorption, and atomic force microscopy. The photocatalytic properties of the films have been evaluated by exposing a methyl orange solution containing the BT films to UV light. The test has shown that the Bi(2)Ti(2)O(7) films have a higher activity in comparison with reference anatase titania films.
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| Titolo: | Sol-Gel Processing of Bi(2)Ti(2)O(7) and Bi(2)Ti(4)O(11) Films with Photocatalytic Activity | |
| Autori: | ||
| Data di pubblicazione: | 2010 | |
| Rivista: | ||
| Abstract: | A new sol-gel synthesis based on chloride compounds as precursors has been used to prepare bismuth titanate (BT) films. The films have been deposited by dip-coating and fired at different temperatures in air; they remain amorphous up to 500 degrees C, and crystallize into the pyrochloric cubic phase Bi(2)Ti(2)O(7) between 600 degrees and 700 degrees C while at higher temperatures of firing the stable Bi(2)Ti(4)O(11) monoclinic phase is formed. The films have been characterized by X-ray diffraction analysis at gracing incidence, X-ray photoelectron spectroscopy, ellipsometric spectroscopy, UV-visible absorption, and atomic force microscopy. The photocatalytic properties of the films have been evaluated by exposing a methyl orange solution containing the BT films to UV light. The test has shown that the Bi(2)Ti(2)O(7) films have a higher activity in comparison with reference anatase titania films. | |
| Handle: | http://hdl.handle.net/11584/61620 | |
| Tipologia: | 1.1 Articolo in rivista |
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