Hydrophilicity of anatase TiO2/Cr-doped TiO2 thin films with different band gaps |
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Authors: | Tae Ho JunKee-Sun Lee Hue Sup Song |
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Affiliation: | Division of Advanced Materials Engineering, Kongju National Univ., Budaedong, Cheonan City, South Korea |
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Abstract: | Based on the concept that the electron-hole separation effect caused by a different band-gap structure would improve its hydrophilicity, anatase-TiO2/Cr-doped TiO2 thin films were synthesized by DC magnetron sputtering. The optical band gaps of TiO2 thin films decreased from 3.23 to 2.95 eV with increasing Cr-doping content. Multilayer TiO2 thin films with different band gaps exhibited a superhydrophilicity under UV illumination. In particular, in anatase TiO2 (3.23 eV)/4.8% Cr-doped TiO2 (2.95 eV), the hydrophilicity, which indicated a contact angle of less than 20°, lasted for 48 h in the dark after UV illumination was discontinued. This outstanding result has rarely been reported for TiO2 thin films, which confirmed that the prominent superhydrophilicity of anatase TiO2/Cr-doped TiO2/glass could be attributed to the retardation of electron-hole recombination caused by the band-gap difference. |
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Keywords: | Titanium oxide Hetrojunction Hydrophilicity Photocatalyticity Sputtering |
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