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Light-induced super-hydrophilicity and photocatalytic activity of mesoporous TiO2 thin films
Yu, JC; Yu, JG; Ho, WK; Zhao, JC
2002-05-31
Source PublicationJOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
ISSN1010-6030
Volume148Issue:1-3Pages:331-339
AbstractTransparent mesoporous TiO2 (MTiO2) and TiO2 nanometer thin films were prepared on fused quartz via the modified reverse micellar and sot-gel methods. The MTiO2 and TiO2 films were characterized by X-ray photoelectron spectroscopy (XPS), atomic force microscopy (ATM), X-ray diffraction (XRD), BET surface area and UV-Vis spectrophotometry. The photoinduced super-hydrophilicity and photocatalytic activity of the films were evaluated by the water contact angle measurement and photocatalytic oxidation of acetone in air, respectively. It was found that MTiO2 thin films at 500 degreesC showed higher photocatalytic activity and better light-induced hydrophilicity than the TiO2 thin films. This is attributed to the following reasons: (1) MTiO2 thin films are composed of smaller monodisperse spherical particles about 15 nm diameter, and possess more mesopores between spherical particles and higher surface areas and surface roughness, (2) the monodispersity of MTiO2 particles was beneficial to the transfer and separation of photo-generated electrons and holes inside of and on the surface of TiO2 particles, and reduced the recombination of photo-generated electrons and holes. At 900 degreesC, the MTiO2 and TiO2 films appeared to be in the rutile phase, but showed photoinduced hydrophilicity and no photocatalytic activity. This confirmed that the mechanism of photoinduced super-hydrophilicity of the films is different from that of photocatalytic oxidation. (C) 2002 Elsevier Science B.V. All rights reserved.
KeywordMesoporous Tio2 Thin Films Modified Reverse Micellar Method Anatase Rutile Photocatalytic Activity Photoinduced Hydrophilicity
Indexed ByISTP ; SCI
Language英语
WOS IDWOS:000176497700044
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:130[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/79434
Collection中国科学院化学研究所
Corresponding AuthorYu, JC
Affiliation1.Chinese Univ Hong Kong, Dept Chem & Mat Sci, Shatin, Hong Kong, Peoples R China
2.Chinese Univ Hong Kong, Technol Res Ctr, Shatin, Hong Kong, Peoples R China
3.Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth, Wuhan 430070, Peoples R China
4.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Lab Photochem, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Yu, JC,Yu, JG,Ho, WK,et al. Light-induced super-hydrophilicity and photocatalytic activity of mesoporous TiO2 thin films[J]. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY,2002,148(1-3):331-339.
APA Yu, JC,Yu, JG,Ho, WK,&Zhao, JC.(2002).Light-induced super-hydrophilicity and photocatalytic activity of mesoporous TiO2 thin films.JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY,148(1-3),331-339.
MLA Yu, JC,et al."Light-induced super-hydrophilicity and photocatalytic activity of mesoporous TiO2 thin films".JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 148.1-3(2002):331-339.
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