Sol–Gel Processing of Bi
 2
 Ti
 2
 O
 7
 and Bi
 2
 Ti
 4
 O
 11
 Films with Photocatalytic Activity

Tongjit Kidchob, Luca Malfatti, Daniela Marongiu, Stefano Enzo, Plinio Innocenzi

doi:10.1111/j.1551-2916.2010.03796.x

<jats:p> <jats:bold> 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 Bi <jats:sub>2</jats:sub> Ti <jats:sub>2</jats:sub> O <jats:sub>7</jats:sub> between 600° and 700°C while at higher temperatures of firing the stable Bi <jats:sub>2</jats:sub> Ti <jats:sub>4</jats:sub> O <jats:sub>11</jats:sub> 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 <jats:sub>2</jats:sub> Ti <jats:sub>2</jats:sub> O <jats:sub>7</jats:sub> films have a higher activity in comparison with reference anatase titania films. </jats:bold> </jats:p>

Sol–Gel Processing of Bi <sub>2</sub> Ti <sub>2</sub> O <sub>7</sub> and Bi <sub>2</sub> Ti <sub>4</sub> O <sub>11</sub> Films with Photocatalytic Activity

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