Nanostructured low crystallized titanium dioxide thin films with good photocatalytic activity

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 °C) were characterized by AFM,...

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Bibliographic Details
Published in:Powder technology 2010-08, Vol.202 (1), p.111-117
Main Authors: López, Alcides, Acosta, Dwight, I. Martínez, Arturo, Santiago, Julio
Format: Article
Language:English
Subjects:
Annealing
Applied sciences
Catalysis
Catalytic reactions
Chemical engineering
Chemistry
Crystallization
Deposition
Exact sciences and technology
General and physical chemistry
Glass
Lime
Low crystallized TiO2
Methylene blue
Miscellaneous
Peroxo-polytitanic acid
Photocatalysis
Solid-solid systems
Spray pyrolysis
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Thin films
Titanium dioxide
Transmission electron microscopy
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Summary: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 °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 °C) show the best photocatalytic activity, against methylene-blue, due principally to their small grain size and high surface area. In this work, transparent and low crystallized TiO 2 thin films were deposited on soda lime glass at different substrate temperature by spray pyrolysis technique from aqueous peroxo-polytitanic acid. The as-prepared films (at 280 °C substrate temperature) have exhibited good photocatalytic activity against aqueous methylene-blue solution. TiO 2 particle size measured by TEM for this material was around 7 nm. [Display omitted]
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2010.04.025