Nanostructured low crystallized titanium dioxide thin films with good photocatalytic activity

✍ Scribed by Alcides López; Dwight Acosta; Arturo I. Martínez; Julio Santiago

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 710 KB
• Volume: 202
• Category: Article
• ISSN: 0032-5910
• DOI: 10.1016/j.powtec.2010.04.025

✦ Synopsis

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 asprepared 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.