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

被引：7

作者：

Dubreuil, O. ^{[1
]}

Dewalque, J. ^{[1
]}

Chene, G. ^{[3
,4
]}

Mathis, F. ^{[3
]}

Spronck, G. ^{[1
]}

Strivay, D. ^{[3
,4
]}

Cloots, R. ^{[1
,2
]}

Henrist, C. ^{[1
,2
]}

机构：

[1] Univ Liege, Dept Chem, CreenMat LCIS, B-4000 Liege, Belgium

[2] Univ Liege, Ctr Appl Technol Microscopy, B-4000 Liege, Belgium

[3] Univ Liege, European Ctr Archaeometry CEA, B-4000 Liege, Belgium

[4] Univ Liege, Inst Atom & Nucl Phys & Spectrometry IPNAS, B-4000 Liege, Belgium

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2011年 / 145卷 / 1-3期

关键词：

Thin films; Surface contamination; Mesoporous anatase TiO2; Atmospheric Ellipsometric Porosimetry; Photocatalytic activity; SENSITIZED SOLAR-CELLS; PORE-SIZE DISTRIBUTION; GAS-SENSING PROPERTIES; SPECTROSCOPIC ELLIPSOMETRY; SURFACE-AREA; PHOTOCATALYTIC ACTIVITY; NANOCRYSTALLINE TIO2; ADSORPTION; POROSITY; RECOMMENDATIONS;

D O I：

10.1016/j.micromeso.2011.04.013

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

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 (6.4 x 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. (C) 2011 Elsevier Inc. All rights reserved.

引用

页码：1 / 8

页数：8

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