Journal
POWDER TECHNOLOGY
Volume 202, Issue 1-3, Pages 111-117Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.powtec.2010.04.025
Keywords
Photocatalysis; Methylene blue; Low crystallized TiO2; Spray pyrolysis; Peroxo-polytitanic acid
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Funding
- CONACYT from Mexico [49536]
- DGAPA-UNAM [IN 109500]
- DGAPA [IN-108609-2]
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Transparent TiO(2) thin films were deposited on soda lime glass at different substrate temperatures by a simple and reproducible spray pyrolysis technique from aqueous peroxo-polytitanic acid. Both the as-prepared and annealed films (3 h thermal treatment in air at 500 degrees C) were characterized by AFM, SEM, TEM, XRD, FT-IR and UV-visible spectroscopy. The as-prepared films present predominant low crystallized structure, low porosity, high surface roughness and grain agglomerates while the annealed films exhibit slightly better polycrystalline structure of brookite phase. The as-deposited TiO(2) films prepared at low substrate temperatures (280 degrees C) show the best photocatalytic activity, against methylene-blue, due principally to their small grain size and high surface area. (C) 2010 Elsevier B.V. All rights reserved.
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