Emission-photoactivity cross-processing of mesoporous interfacial charge transfer in Eu3+ doped titania

被引：20

作者：

Leroy, Celine Marie ^{[1
]}

Wang, Hong Feng ^{[1
]}

Fargues, Alexandre ^{[1
]}

Cardinal, Thierry ^{[1
]}

Jubera, Veronique ^{[1
]}

Treguer-Delapierre, Mona ^{[1
]}

Boissiere, Cedric ^{[2
]}

Grosso, David ^{[2
]}

Sanchez, Clement ^{[2
]}

Viana, Bruno ^{[2
]}

Pelle, Fabienne ^{[2
]}

机构：

[1] Univ Bordeaux, CNRS, ICMCB, F-33608 Pessac, France

[2] UPMC, ENSCP, CNRS UMR7574, F-75252 Paris, France

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2011年 / 13卷 / 25期

关键词：

THIN-FILMS; PHOTOCATALYTIC ACTIVITY; TRIVALENT EUROPIUM; OPTICAL-PROPERTIES; TIO2; NANOCRYSTALS; DIOXIDE; LUMINESCENCE; LIGHT; IONS; NANOPARTICLES;

D O I：

10.1039/c0cp02509g

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Periodic mesoporous Eu3+ doped titania materials were obtained through the EISA (Evaporation Induced Self Assembly) process. Eu3+ ions, entrapped within the semi-crystalline walls of the highly porous framework, appear to be advantageous during the probing of surface photochemical reactions. Its emission intensity is very sensitive to the presence of physisorbed molecules, in gas or liquid phase, that reside within the pores. In particular, strong fluctuations in intensity of the D-5(0) -> F-7(2) transition were observed under UV light exposure on the time scale of tens of seconds. The emission modulation dynamics show a strong correlation with the crystallinity of the titania matrix. Correlation of the emission with the photocatalytic activity of the semiconductor for photodegradation of an organic molecule is observed. A model is proposed to describe the involved mechanisms.

引用

页码：11878 / 11884

页数：7

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