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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/4108

Title: Preparation of nanocrystalline titania films with different porosity by water-based chemical solution deposition
Authors: TRUIJEN, Ine
VAN BAEL, Marlies
VAN DEN RUL, Heidi
D'HAEN, Jan
MULLENS, Jules
Issue Date: 2007
Publisher: SPRINGER
Citation: JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, 43(3). p. 291-297
Abstract: This study describes the synthesis of nanocrystalline titania layers on silicon and glass substrates by chemical solution deposition, using a water-based citratoperoxo-Ti(IV) precursor solution. The same aqueous solution-gel precursor is used for deposition of, both, thin dense layers by spin-coating and thicker porous layers by tape-casting. In the latter, the precursor solution is modified by the addition of polyvinyl alcohol (PVA), which acts as a thickener and pore-forming agent. Phase composition, film morphology, and the hydrophilic character of the films are studied by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-VIS transmission measurements, variable angle spectroscopic ellipsometry (VASE), and by contact angle measurements. The thin 180 nm titania film, deposited from the unmodified precursor solution, shows a density of about 96%. Upon ultraviolet illumination, it acquires a highly hydrophilic surface. One hour of illumination is sufficient to obtain a water contact angle of almost 0 degrees. Furthermore, the hydrophilisation process shows to be reversible. Tape-casting and thermal treatment of the modified precursor solution gives rise to the formation of a 500 nm thick, porous, pure anatase film. The nanocrystalline thick film is composed of 20-40 nm particles, and contains clearly defined pores of 20 nm, homogeneously distributed along the surface.
Notes: Hasselt Univ, Inst Mat Res, Lab Inorgan & Phys Chem, B-3590 Diepenbeek, Belgium. IMEC, Div IMOMEC, B-3590 Diepenbeek, Belgium. Hasselt Univ, Mat Res Inst, Phys Anal Grp, B-3590 Diepenbeek, Belgium.Truijen, I, Hasselt Univ, Inst Mat Res, Lab Inorgan & Phys Chem, Agoralaan-Bldg D, B-3590 Diepenbeek, Belgium.ine.truijen@uhasselt.be marlies.vanbael@uhasselt.be heidi.vandenrul@uhasselt.be jan.dhaen@uhasselt.be jules.mullens@uhasselt.be
URI: http://hdl.handle.net/1942/4108
DOI: 10.1007/s10971-007-1587-x
ISI #: 000248381400004
ISSN: 0928-0707
Category: A1
Type: Journal Contribution
Validation: ecoom, 2008
Appears in Collections: Research publications

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