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Issue 19, 2013
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Controlled growth of epitaxial CeO2 thin films with self-organized nanostructure by chemical solution method

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Abstract

Chemical solution deposition is a versatile technique to grow oxide thin films with self-organized nanostructures. Morphology and crystallographic orientation control of CeO2 thin films grown on technical NiW substrates by a chemical solution deposition method are achieved in this work. Based on an enhanced understanding of the effect of oxygen partial pressure during film crystallization, a strong texture can be obtained on the surface of the CeO2 films annealed at temperatures as low as 900 °C followed by a two-step annealing procedure. Crystallization at high temperature (e.g., 1100 °C) in a reducing atmosphere leads to the formation of an oxygen deficient CeO2−x phase coexisting with a small amount of a polycrystalline CeO1.67 phase. Further surface phase and texture analysis by an electron backscattering diffraction technique reveals that the off-stoichiometric CeO2−x phase retains a fluorite structure but exhibits an alternative in-plane texture with eight fold symmetry on the surface. According to phase and texture stability studies, these off-stoichiometric phases gradually transform back to fully oxidized CeO2 with a 45° rotated cube texture during storage in ambient air. Moreover, the morphology of the CeO2 thin films is controlled by precisely regulating the film thickness and crystallization temperature. A temperature-induced transition from the commonly observed granular grain to an atomically flat surface is found in the CeO2–NiW constitution. Cross-sectional transmission electron microscope observation also reveals that this phenomenon is mainly attributable to the surface re-organization, which is strongly associated with the critical film thickness, crystallization temperature, reducing ability of the crystallization atmosphere as well as the interface properties.

Graphical abstract: Controlled growth of epitaxial CeO2 thin films with self-organized nanostructure by chemical solution method

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Article information


Submitted
05 Feb 2013
Accepted
06 Mar 2013
First published
07 Mar 2013

CrystEngComm, 2013,15, 3816-3823
Article type
Paper

Controlled growth of epitaxial CeO2 thin films with self-organized nanostructure by chemical solution method

Y. Zhao and J. Grivel, CrystEngComm, 2013, 15, 3816
DOI: 10.1039/C3CE40245B

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