Highly Photoactive Porous Anatase Films Obtained by Deformation of 3D Mesostructures

被引：37

作者：

Kimura, Tatsuo ^{[1
]}

Yamauchi, Yusuke ^{[2
,3
]}

Miyamoto, Nobuyoshi ^{[4
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Adv Mfg Res Inst, Moriyama Ku, Nagoya, Aichi 4638560, Japan

[2] Natl Inst Mat Sci, World Premier Int WPI Res Ctr Mat Nanoarchitectur, Tsukuba, Ibaraki 3050044, Japan

[3] Japan Sci & Technol Agcy JST, Precursory Res Embryon Sci & Technol PRESTO, Kawaguchi, Saitama 3320012, Japan

[4] Fukuoka Inst Technol, Dept Life Environm & Mat Sci, Higashi Ku, Fukuoka 8110295, Japan

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2011年 / 17卷 / 14期

关键词：

crystal growth; mesoporous materials; photochemistry; sol-gel processes; thin films; MESOPOROUS METAL-OXIDES; TITANIA THIN-FILMS; PHOTOCATALYTIC ACTIVITY; TIO2; CRYSTALLINITY; SILICATES; DESIGN; ACID;

D O I：

10.1002/chem.201002939

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A transparent film of three-dimensional (3D) hexagonal (P6(3)/mmc) mesostructured titania was fabricated according to a modified procedure using triblock copolymer Pluronic P123. The precursor solution was diluted with ethanol and spin-coated to afford a transparent film with a thickness of less than 100 nm. The mesostructure was maintained (deteriorated) at 400 degrees C, converted to regularly arranged anatase nanopillars with sufficient porosity at 550 degrees C, and deformed at 700 degrees C to nanocrystals with intercrystalline mesospaces. The mesostructural variation was related to the degree of shrinkage of the film owing to condensation and crystallization of the titania frameworks. An anatase nanocrystal film having sufficient porosity and high crystallinity was most active in the photodegradation of methylene blue. Such intercrystalline mesospaces can be controlled by regular deformation of 3D mesostructures through anatase nanopillar structures. In addition to adequate crystallinity of the titania frameworks, smooth diffusion of target organic molecules and/or degraded organic compounds was important for effective photodegradation.

引用

页码：4005 / 4011

页数：7

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