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Understanding crystallization processes of NiO/Ce0.9Gd0.1O2−δ sol–gel processed thin films for the design of efficient electrodes: an in situ thermal ellipsometry analysis

Abstract : We describe a simple, non-destructive method, in situ thermal ellipsometry analysis (TEA), for understanding the different processes (decomposition of organics, crystallization, and sintering) occurring upon heating hybrid organic–inorganic films. According to these studies, a thermal treatment was tailored in order to obtain robust, nanocrystalline inorganic mesoporous 100–150 nm thick films with efficiently connected porosity surrounded by a crystalline inorganic network. Polymodal porous, nanocrystalline NiO/Gd-doped Ceria composites or Ni/Gd-doped Ceria films, interconnected network of open pores ranging from macro- to micro-pores, have been synthesized. The inorganic network is built from connected crystalline nanoparticles with mean diameters of 12 ± 3 nm, whose small size is still preserved even at 800 °C. We also show that the thermal ellipsometry analysis is readily extendable to MO/Gd-doped Ceria with M = Cu, Ni, Co, etc., therefore demonstrating the interest of this technique in understanding thermal phenomena in complex ceramic and composite systems. This is trivial for designing electrodes with efficient microstructure.
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https://hal.archives-ouvertes.fr/hal-01468502
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Submitted on : Wednesday, February 15, 2017 - 3:09:06 PM
Last modification on : Wednesday, October 14, 2020 - 4:06:11 AM

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Guillaume Muller, Cédric Boissière, David Grosso, Armelle Ringuedé, Christel Laberty-Robert, et al.. Understanding crystallization processes of NiO/Ce0.9Gd0.1O2−δ sol–gel processed thin films for the design of efficient electrodes: an in situ thermal ellipsometry analysis. Journal of Materials Chemistry, Royal Society of Chemistry, 2012, 22 (18), pp.9368-9373. ⟨10.1039/c2jm16550c⟩. ⟨hal-01468502⟩

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