Role of water adsorption in photoinduced superhydrophilicity on TiO{sub 2} thin films
- Service de Physique de l'Etat Condense (CNRS URA 2464), DSM/DRECAM/SPEC, CEA Saclay, 91191 Gif sur Yvette Cedex (France)
The ultraviolet (UV) irradiation of a titanium dioxide (TiO{sub 2}) film surface gives rise to two simultaneous phenomena: photocatalysis and superhydrophilicity. Photocatalysis has been thoroughly studied, but the mechanism governing superhydrophilicity remains controversial. The authors' investigations show the effects induced by UV irradiation on the water adsorption and desorption on the TiO{sub 2} surface. The observations prove that superhydrophilicity cannot be solely induced by the removal of organic contamination via photocatalysis, but is associated with water adsorption most probably due to the appearance of hydroxyl groups on surface defects.
- OSTI ID:
- 20971902
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 18 Vol. 90; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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