title: Emission-photoactivity cross-processing of mesoporous interfacial charge transfer in Eu3+ doped titania.
abstract: Periodic mesoporous Eu(3+) doped titania materials were obtained through the EISA (Evaporation Induced Self Assembly) process. Eu(3+) 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 (5)D(0)→(7)F(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.
authors.affiliation: CNRS, Université de Bordeaux, ICMCB, 87 avenue du Dr. A. Schweitzer, 33608 Pessac, France.
authors.forename: Céline Marie
authors.initials: CM
authors.lastname: Leroy
authors.forename: Hong Feng
authors.initials: HF
authors.lastname: Wang
authors.forename: Alexandre
authors.initials: A
authors.lastname: Fargues
authors.forename: Thierry
authors.initials: T
authors.lastname: Cardinal
authors.forename: Véronique
authors.initials: V
authors.lastname: Jubera
authors.forename: Mona
authors.initials: M
authors.lastname: Treguer-Delapierre
authors.forename: Cédric
authors.initials: C
authors.lastname: Boissière
authors.forename: David
authors.initials: D
authors.lastname: Grosso
authors.forename: Clément
authors.initials: C
authors.lastname: Sanchez
authors.forename: Bruno
authors.initials: B
authors.lastname: Viana
authors.forename: Fabienne
authors.initials: F
authors.lastname: Pellé