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Formation of ultra-thin ceramic TiO2 films by the Langmuir-Blodgett technique - a two dimensional sol-gel process at the air-water interface

Oswald, Monika ; Hessel, Volker ; Riedel, Ralf (1999):
Formation of ultra-thin ceramic TiO2 films by the Langmuir-Blodgett technique - a two dimensional sol-gel process at the air-water interface.
339, In: Thin Solid Films, (1-2), pp. 284-289. Elsevier, ISSN 00406090,
DOI: 10.1016/S0040-6090(98)01228-0,
[Article]

Abstract

Different molecular titanium alkoxides were investigated as precursors for the synthesis of thin to ultra-thin TiO2 ceramic films. The films were prepared by the Langmuir–Blodgett technique. Therefore, the precursor was dissolved in CHCl3 and subsequently spread on water, aqueous acetic acid and aqueous acetylacetone as the subphase. Hydrolysis of the titanium alkoxides, namely Ti(OR)4−x(OR′)x with x=0 (R=n-C4H9 or n-C9H19) and x=2 (R=n-C4H9 and View the MathML source) and [(RO)2Ti-O-]n with R=n-C4H9 was performed at the air–water interface. This reaction can be considered as a two-dimensional sol-gel-process. The surface-pressure–area (π–A) isotherms as well as the influence of the molecular structure of the precursor on the morphology of the resulting condensation products (gels) are discussed. Pyrolysis of the transferred gels under oxygen atmosphere up to 700°C gives the desired TiO2-layers.

Item Type: Article
Erschienen: 1999
Creators: Oswald, Monika ; Hessel, Volker ; Riedel, Ralf
Title: Formation of ultra-thin ceramic TiO2 films by the Langmuir-Blodgett technique - a two dimensional sol-gel process at the air-water interface
Language: English
Abstract:

Different molecular titanium alkoxides were investigated as precursors for the synthesis of thin to ultra-thin TiO2 ceramic films. The films were prepared by the Langmuir–Blodgett technique. Therefore, the precursor was dissolved in CHCl3 and subsequently spread on water, aqueous acetic acid and aqueous acetylacetone as the subphase. Hydrolysis of the titanium alkoxides, namely Ti(OR)4−x(OR′)x with x=0 (R=n-C4H9 or n-C9H19) and x=2 (R=n-C4H9 and View the MathML source) and [(RO)2Ti-O-]n with R=n-C4H9 was performed at the air–water interface. This reaction can be considered as a two-dimensional sol-gel-process. The surface-pressure–area (π–A) isotherms as well as the influence of the molecular structure of the precursor on the morphology of the resulting condensation products (gels) are discussed. Pyrolysis of the transferred gels under oxygen atmosphere up to 700°C gives the desired TiO2-layers.

Journal or Publication Title: Thin Solid Films
Volume: 339
Number: 1-2
Publisher: Elsevier
Uncontrolled Keywords: TiO2films, Langmuir–Blodgett technique, Sol-gel process, Air–water interface
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 19 Nov 2008 16:23
DOI: 10.1016/S0040-6090(98)01228-0
Funders: R.R. thanks the Fonds der Chemischen Industrie for financial support.
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