CHARACTERIZATION OF A HETEROSTRUCTURETiO2/SnO2:F/SUBSTRATE WITH TWO DIFFERENT GEOMETRIES, PREPARED BY SPRAY PYROLYSIS TO BE USED AS PHOTOCATALYST

E. I. Velázquez-Cruz, K. M. Anaya-Castillejos, R. Martínez-Martínez (), A. B. Soto-Guzmán and C. Falcony
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E. I. Velázquez-Cruz: Instituto de Agroindustrias, Universidad Tecnológica de la Mixteca, Carretera a Acatlima Km. 2.5, Huajuapan de León, Oaxaca 69000, México
K. M. Anaya-Castillejos: Instituto de Agroindustrias, Universidad Tecnológica de la Mixteca, Carretera a Acatlima Km. 2.5, Huajuapan de León, Oaxaca 69000, México
R. Martínez-Martínez: Instituto de Física y Matemáticas, Universidad Tecnológica de la Mixteca, Carretera a Acatlima Km. 2.5, Huajuapan de León, Oaxaca 69000, México
A. B. Soto-Guzmán: Departamento de Física CINVESTAV-IPN P.O.14-7400, 07000 D.F., México
C. Falcony: Departamento de Física CINVESTAV-IPN P.O.14-7400, 07000 D.F., México

Surface Review and Letters (SRL), 2013, vol. 20, issue 03n04, 1-8

Abstract: TwoTiO2/SnO2:F/substrate hetero-structures (HS) with different geometry were deposited by spray pyrolysis. The thickness for theTiO2andSnO2:Ffilms was 3.8 μm and 2.3 μm, and the band gap energy 3.3 eV and 3.6 eV, respectively. Both films have a transmittance greater than 70% in most of the visible spectrum. The electrical resistivity of theSnO2:Ffilm was ρ = (1.7)×10-4Ω ⋅ cm. The surface morphology of theTiO2film shows hemispheric agglomerates formed by nano-metric needle/platy shaped particles that give them a porous texture much like a "ball of wool," the length of the needles is from 100 nm and its thickness close to 20 nm. The geometry of HS has an important influence on its efficiency as photocatalyst under low-powered UV radiation. One of the geometry for this HS, in which theTiO2/SnO2:Finterface is exposed, showed greater efficiency than theTiO2andSnO2:Ffilms separately, or than the common "sandwich" type HS geometry. Specifically, a decrease by 62% of the initial concentration of a watery solution of methylene blue (mb) of 20 ppm in approximately 5 h of UV radiation is observed for the exposed interface HS compared with less than 30% reduction observed for the common sandwich type HS.

Keywords: Pyrolysis; TiO2; SnO2:F; photocatalyst (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1142/S0218625X1350042X

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