Premium
Sol–Gel Processing of Bi 2 Ti 2 O 7 and Bi 2 Ti 4 O 11 Films with Photocatalytic Activity
Author(s) -
Kidchob Tongjit,
Malfatti Luca,
Marongiu Daniela,
Enzo Stefano,
Innocenzi Plinio
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.03796.x
Subject(s) - x ray photoelectron spectroscopy , methyl orange , materials science , anatase , monoclinic crystal system , photocatalysis , amorphous solid , bismuth titanate , dip coating , sol gel , thin film , chemical engineering , analytical chemistry (journal) , nuclear chemistry , coating , crystallography , nanotechnology , crystal structure , chemistry , organic chemistry , ferroelectricity , optoelectronics , dielectric , engineering , catalysis
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 2 Ti 2 O 7 between 600° and 700°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.