TiO2 mesoporous thin films studied by Atmospheric Ellipsometric Porosimetry: A case of contamination

[en] Anatase mesoporous TiO2 thin ﬁlms are frequently prepared by surfactant templating to control porosity development and Atmospheric Ellipsometric Porosimetry is a reliable and fast technique allowing the determination of the porosity of such ﬁlms. After prolonged exposition to high-vacuum (6×10-6 mbar), the ﬁlms porosity exhibits a degraded behavior during porosimetric measurements, indicating a vacuum-induced modiﬁcation. The main effect resulting from such exposition to high-vacuum is a wet- tability modiﬁcation of the ﬁlms, resulting in an increase of the hydrophobic character of the TiO2 surface. This evolution induces non-correct results in porosimetric measurements due to the fact that the contact angle parameter needed to calculate the pore size distribution is highly different from the reference ﬁlms. A surface contamination explains such modiﬁcations and a restoration of the ﬁlms is obtained by using ultraviolet treatment.

Research Center/Unit :

Laboratoire de Chimie Inorganique Structurale (LCIS, ULiège)
Groupe de Recherche en Energie et ENvironnement à partir des MATériaux (GREEnMat, ULiège)
Institut de Physique Nucléaire, Atomique et de Spectroscopie (IPNAS, ULiège)

Disciplines :

Chemistry
Physics

Author, co-author :

Dubreuil, Olivier ; Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT

Dewalque, Jennifer ; Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT

Chene, Grégoire ; Université de Liège - ULiège > Département de physique > Physique nucléaire, atomique et spectroscopie

Mathis, François ; Université de Liège - ULiège > Centre européen en archéométrie

Spronck, Gilles ; Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT

Strivay, David ; Université de Liège - ULiège > Département de physique > Physique nucléaire, atomique et spectroscopie

Cloots, Rudi ; Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT

Henrist, Catherine ; Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT

Language :

English

Title :

TiO2 mesoporous thin films studied by Atmospheric Ellipsometric Porosimetry: A case of contamination

Publication date :

2011

Journal title :

Microporous and Mesoporous Materials

ISSN :

1387-1811

eISSN :

1873-3093

Publisher :

Elsevier Science

Volume :

147

Pages :

1-8

Peer reviewed :

Peer Reviewed verified by ORBi

Name of the research project :

PHOTOCEL-0616464/0616465 - INANOMAT-P6/17

Funders :

DGTRE - Région wallonne. Direction générale des Technologies, de la Recherche et de l'Énergie

Commentary :

Thin ﬁlms Surface contamination Mesoporous anatase TiO2 Atmospheric Ellipsometric Porosimetry Photocatalytic activity

Available on ORBi :

since 28 April 2011

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