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Wetting Angles on Illuminated Ta2O5 Thin Films with Controlled Nanostructure

Opened Access Wetting Angles on Illuminated Ta2O5 Thin Films with Controlled Nanostructure

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Autor: Rico Gavira, Víctor Joaquín
Borrás Martos, Ana Isabel
Yubero Valencia, Francisco
Espinós Manzarro, Juan Pedro
Frutos Rayego, Fabián
Rodríguez González Elipe, Agustín
Departamento: Universidad de Sevilla. Departamento de Física Aplicada I
Fecha: 2009
Publicado en: Journal of Physical Chemistry C, 113 (9), 3775–3784
Tipo de documento: Artículo
Resumen: Ta2O5 thin films with different nanostructure and surface roughness have been prepared by electron evaporation at different angles between the evaporation source and the substrates. Large variation of refraction indexes (n) from 1.40 to 1.80 were obtained by changing the geometry of evaporation and/or by annealing the evaporated films at increasing temperatures up to 1000 °C to make them crystalline. Very flat and compact thin films (n ) 2.02) were also obtained by assisting the growth by bombardment with O2 + ions of 800 eV kinetic energy. A similar correlation has been found between the wetting contact angle of water and the roughness of the films for the evaporated and evaporated + annealed samples, irrespective of their procedure of preparation and other microstructural characteristics. When the films were illuminated with UV light of h > Eg ) 4.2 eV (Eg, band gap energy of Ta2O5), their surface became superhydrophilic (contact angle < 10°) in a way quite similar to thos...
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Tamaño: 550.0Kb
Formato: PDF

URI: http://hdl.handle.net/11441/30895

DOI: http://dx.doi.org/10.1021/jp805708w

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