Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8034627 | Thin Solid Films | 2015 | 50 Pages |
Abstract
Tungsten oxide nanostructured films were grown on tungsten substrates by anodisation under a fixed voltage and with sodium fluoride as electrolyte. The effect of the anion chloride and the influence of the modifying agent disodium hydrogen phosphate in the tungsten oxide films were also investigated. The structural characterisation of the films was performed by scanning electron microscopy, atomic force microscopy and Raman spectroscopy. The band gap was determined through diffuse reflectance spectroscopy. The thin films were photoluminescent and emitted in the range of 300 to 630Â nm when irradiated at 266Â nm. The synthesised films efficiently degraded of methyl orange dye in the presence of hydrogen peroxide and 250Â nm radiation. The modifying agent was responsible for the improvement of the photocatalytic activity. Films with similar photocatalytic performance were obtained when the system sodium fluoride and disodium hydrogen phosphate were replaced by sodium chloride. The porous structure and low band gap values were responsible for the photocatalytic behaviour.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Nadja B.D. da Costa, Julia C.O. Pazinato, Guilherme Sombrio, Marcelo B. Pereira, Henri Boudinov, André Gündel, Eduardo C. Moreira, Irene T.S. Garcia,