Abstract
The photoinduced wettabilities of both water and hexadecane on a polycrystalline anatase TiO2 thin film were investigated. An amphiphilic surface was produced on the polycrystalline TiO2 thin film by UV illumination as on the rutile single crystal. Further illumination of the amphiphilic surface increased the hexadecane contact angle gradually and produced a hydrophilic−oleophobic surface. The total energies of the illuminated UV light to produce and terminate the amphiphilic state were independent of the UV light intensity. This wettability change is attributable to the variations of hydrophilicizing rate of TiO2 grains, and the resultant hydrophilic−oleophobic property may contribute to overall self-cleaning performance of the TiO2 thin films.
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