Kidchob, Tongjit and Malfatti, Luca and Marongiu, Daniela and Enzo, Stefano and Innocenzi, Plinio (2010) Sol–gel processing of Bi2Ti2O7 and Bi2Ti4O11 films with photocatalytic activity. Journal of the American Ceramic Society, Vol. 93 (9), p. 2897-2902. eISSN 1551-2916. Article.
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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°C, and crystallize into the pyrochloric cubic phase Bi2Ti2O7 between 600° and 700°C while at higher temperatures of firing the stable Bi2Ti4O11 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 Bi2Ti2O7 films have a higher activity in comparison with reference anatase titania films.
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