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

页码：2609 / 2612

页数：4

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