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Cracking of titania nanocrystalline coatings

Mahé, Marie and Heintz, Jean-Marc and Rödel, Jürgen and Reynders, Peter (2008):
Cracking of titania nanocrystalline coatings.
In: Journal of the European Ceramic Society, pp. 2003-2010, 28, (10), ISSN 09552219,
[Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2008.02.002],
[Article]

Abstract

Cracking of wet-chemically precipitated nanocrystalline TiO2 films deposited on different platelet-like substrates is investigated. The thicknesses of the films are also in the nanometric range: 60, 140 or 300 nm. Scanning electron microscopy, X-ray diffraction and nitrogen adsorption are employed to determine layer thickness, grain size, and porosity. The synthesis of TiO2 films through an aqueous route affords very good reproducibility of these properties (layer thickness ±5 nm). Mica, SiO2 and Al2O3 platelets are used as substrates, providing different properties with regard to surface charge, structure and roughness. The drying step is found to be responsible for the cracking of some of the TiO2 layers and the evolution of the cracks during sintering is related to shrinkage of the substrate. Film thickness as well as the chemical nature of the substrate influences the cracking of nanocrystalline TiO2 films during the drying step.

Item Type: Article
Erschienen: 2008
Creators: Mahé, Marie and Heintz, Jean-Marc and Rödel, Jürgen and Reynders, Peter
Title: Cracking of titania nanocrystalline coatings
Language: English
Abstract:

Cracking of wet-chemically precipitated nanocrystalline TiO2 films deposited on different platelet-like substrates is investigated. The thicknesses of the films are also in the nanometric range: 60, 140 or 300 nm. Scanning electron microscopy, X-ray diffraction and nitrogen adsorption are employed to determine layer thickness, grain size, and porosity. The synthesis of TiO2 films through an aqueous route affords very good reproducibility of these properties (layer thickness ±5 nm). Mica, SiO2 and Al2O3 platelets are used as substrates, providing different properties with regard to surface charge, structure and roughness. The drying step is found to be responsible for the cracking of some of the TiO2 layers and the evolution of the cracks during sintering is related to shrinkage of the substrate. Film thickness as well as the chemical nature of the substrate influences the cracking of nanocrystalline TiO2 films during the drying step.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 28
Number: 10
Uncontrolled Keywords: Sintering; Drying; Films; Defects; TiO2
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 18 May 2011 15:19
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2008.02.002
Identification Number: doi:10.1016/j.jeurceramsoc.2008.02.002
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