Emission-photoactivity cross-processing of mesoporous interfacial charge transfer in Eu<sup>3+</sup> doped titania
Language
en
Article de revue
This item was published in
Physical Chemistry Chemical Physics. 2011, vol. 13, n° 25, p. 11878-11884
Royal Society of Chemistry
English Abstract
Periodic mesoporous Eu<sup>3+</sup> doped titania materials were obtained through the EISA (Evaporation Induced Self Assembly) process. Eu<sup>3+</sup> ions, entrapped within the semi-crystalline walls of the highly porous ...Read more >
Periodic mesoporous Eu<sup>3+</sup> doped titania materials were obtained through the EISA (Evaporation Induced Self Assembly) process. Eu<sup>3+</sup> 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 <sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>2</sub> 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.Read less <
English Keywords
Europium
Photocalysis
Luminescence
Porous materials
Origin
Hal imported