Étude des relations entre les propriétés physicochimiques et photocatalytiques de revêtements nanostructurés de dioxyde de titane synthétisés par pulvérisation cathodique magnétron en condition réactive

Abstract : aThe photocatalysis is a new way of organic pollutants treatments which needs a low energy supplied under light wave. The use of supported catalyst allows an efficient separation of the reaction products, in spite of their specific area reduction. Owing to the advantages that offers reactive sputtering (good mechanical adhesion, synthesis on cold substrates, easy control of the microstructure, ...), the synthesis by this technique of the most promising semiconductor photocatalyst, namely the titanium dioxide, is the subject of intensive researchs. After a description of the mechanisms occurring during a photocatalytic reaction, the physical phenomena at the origin of the ceramic coating synthesis are detailed. In order to hinder the sodium contamination of the catalyst from the glass substrate, a SiNx diffusion barrier is intercalated. The influences of the substrate position relatively to the metallic flux, the annealing temperature, the total pressure and the TiO2 coating thickness on the physico-chemical and photocatalytic properties are investigated allowing the formulation of hypothetic relations combining them. Finally, first studies on in situ crystallized TiO2-xNy photocatalyst deposited at high pressure are presented
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Eric Aubry. Étude des relations entre les propriétés physicochimiques et photocatalytiques de revêtements nanostructurés de dioxyde de titane synthétisés par pulvérisation cathodique magnétron en condition réactive. Autre. Institut National Polytechnique de Lorraine, 2007. Français. ⟨NNT : 2007INPL104N⟩. ⟨tel-01752912⟩

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