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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 those reported for illuminated TiO2 thin films. The rate of transformation into the superhydrophilicstate was smaller for the crystalline than for the amorphous films, suggesting that in Ta2O5 the size of crystaldomains at the surface is an important parameter for the control of this kinetics. Changes in the water contactangle on films illuminated with visible light were also found when they were subjected to implantation withN2+ ions of 800 eV kinetic energy. The origin of this photoactivity is discussed in terms of the electronicband gap states associated with the nitrogen-implanted atoms. The possibility of preparing antireflective andself-cleaning coatings of Ta2O5 is discussed

Wetting Angles on Illuminated Ta2O5 Thin Films with Controlled Nanostructure

Wetting Angles on Illuminated Ta₂O₅ Thin Films with Controlled Nanostructure