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Synthèse de nanoparticules d'oxydes de titane ou de vanadium à basse valence

Abstract : This PhD work deals with the development of new synthesis pathways for low valence titanium or vanadium oxide nanoparticles. These oxides are attracting an increasing interest for applications such as thermoelectricity, data or energy storage, especially at the nanoscale where performances can be enhanced. However the synthesis of these solids at nanoscale is a challenge. In this work, the synthesis of nanoparticles of several low or mixed valence titanium oxides is studied. The approach that are explored are based on the reduction of titanium dioxide nanoparticles by metallic hydrides in molten salts. It enables control over phase, size and morphology of the nanoparticles. The synthesis of V2O3 nanoparticles from molecular precursors in molten salts has also been developed, in order to control the structure, size and morphology of the nanoparticles. This pathway enables the synthesis of a non-identified vanadium containing oxide and lays the foundation for the synthesis of vanadium Magnéli phases at the nanoscale. Finally the surface reactivity of nanoparticles of Ti4O7 and Ti6O11 Magnéli phases were explored by Near ambient pressure-X ray photoelectron spectroscopy.
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Submitted on : Saturday, November 28, 2020 - 1:02:07 AM
Last modification on : Tuesday, January 25, 2022 - 5:10:29 PM


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Jérôme Capitolis. Synthèse de nanoparticules d'oxydes de titane ou de vanadium à basse valence. Matériaux. Sorbonne Université, 2018. Français. ⟨NNT : 2018SORUS499⟩. ⟨tel-03029248⟩



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