Photocatalytic activity of nanostructured TiO2 thin films prepared by pulsed spray pyrolysis

• Autores: López, Alcides, Acosta, Dwight, Martínez, Arturo
• Formato: artículo
• Fecha de Publicación: 2006
• Institución: Instituto Peruano de Energía Nuclear
• Repositorio: IPEN-Institucional
• Lenguaje: inglés
• OAI Identifier: oai:repositorio.ipen.gob.pe:20.500.13054/459
• Enlace del recurso: https://hdl.handle.net/20.500.13054/459
• Nivel de acceso: acceso abierto
• Materia: Óxidos de titanio; Fotocatálisis; Pirolisis; Capas finas

Nano-structured TiO2 thin films were deposited onto soda lime glass by the pneumatic spray pyrolysis method from a peroxo-titanium complex solution. Samples were prepared spraying 10 s the complex solution followed by an interruption of 20 s in order to avoid inadequate substrate cooling, the substrate temperature was varied from 230 to 430 °C in 50 °C steps. Amorphous as-deposited films crystallized to the anatase phase after an annealing process at 500 °C for 3 h. The photocatalytic activity of the nanostructured TiO2 thin films was studied under UV irradiation with the degradation of methylene-blue. Amorphous as-deposited TiO2 films prepared at low substrate temperatures (280 °C) showed the best photocatalytic activity, but after the annealing process films exhibit a decrease in the photocatalytic activity due to both the increase in the grain size and the decrease in the surface area.