Hydrophilicity of anatase TiO2/Cr-doped TiO2 thin films with different band gaps

被引：19
|
作者：
Jun, Tae Ho [1 ]
Lee, Kee-Sun [1 ]
Song, Hue Sup [1 ]
机构：
[1] Kongju Natl Univ, Div Adv Mat Engn, Cheonan, South Korea
来源：
THIN SOLID FILMS | 2012年 / 520卷 / 07期
基金：
新加坡国家研究基金会;
关键词：
Titanium oxide; Hetrojunction; Hydrophilicity; Photocatalyticity; Sputtering; PHOTOCATALYTIC ACTIVITY; WETTABILITY CONTROL; TITANIUM-DIOXIDE; OXIDE-FILMS; SURFACE; DEPOSITION; PRINCIPLES;
D O I：
10.1016/j.tsf.2011.11.026
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：2609 / 2612
页数：4
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