Effect of scandium on the structural and photocatalytic properties of titanium dioxide thin films

Pure and scandium doped-TiO₂ thin films were prepared by the sol-gel process and coated by dip coating. The effects of scandium on the phase formation, optical properties and photoactivity of the TiO₂ thin films were investigated. The lattice parameters and the crystallinity of the anatase phase, ch...

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Bibliographic Details
Published in:Journal of materials science 2008-01, Vol.43 (2), p.602-608
Main Authors: Cavalheiro, A. A, Bruno, J. C, Saeki, M. J, Valente, J. P. S, Florentino, A. O
Format: Article
Language:English
Subjects:
absorption
Anatase
Catalysis
catalysts
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Classical Mechanics
coatings
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Crystal structure
Crystallinity
Crystallography and Scattering Methods
Efficiency
energy
Energy gap
Exact sciences and technology
General and physical chemistry
Immersion coating
Lattice parameters
Materials Science
Optical properties
Parameter modification
Photochemistry
Photodegradation
photolysis
Physical chemistry of induced reactions (with radiations, particles and ultrasonics)
Polymer Sciences
Rietveld method
Scandium
Sol-gel processes
sol-gel processing
Solid Mechanics
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Thin films
Titanium dioxide
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Summary:Pure and scandium doped-TiO₂ thin films were prepared by the sol-gel process and coated by dip coating. The effects of scandium on the phase formation, optical properties and photoactivity of the TiO₂ thin films were investigated. The lattice parameters and the crystallinity of the anatase phase, characterized by the Rietveld method, demonstrated that scandium doping affected the structural parameters and crystallinity of the films, modifying the absorption edge. A direct correlation was found between band gap energy and photodegradation efficiency, with lower values of band gap energy augmenting this efficiency. Moreover, a significant improvement in the catalyst’s photodegradation efficiency was attained with a scandium concentration of 5.0 mol%.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-007-1743-2