Synthèse et propriétés photoélectrochimiques de nanoparticules d’argent intégrées dans des films d’oxydes mésoporeux

Abstract : The study and understanding of existing interactions between semiconductor and metal nanoparticles under irradiation is essential for improving their performance. In this study, three semiconductor-metal oxide composites were synthesized: TiO2-Ag, Fe2O3-Ag and WO3-Ag. The synthesis of the mesoporous films of TiO2, Fe2O3 and WO3 was carried out by gel sol method using block copolymers, with the method of self-assembly induced by evaporation (EISA). The silver nanoparticles are formed in a second time by chemical reduction of silver salts in the porosity of the films. The photo-electrochemical study of these composites made it possible to highlight various phenomena: the electroreduction potential of Ag+ ions in a mesoporous TiO2 matrix can be modulated by the effect of light. This phenomenon seems to result from a passivation effect of the NP Ag by TiO2, which depends on the insolation conditions. Charging effects of the porous electrode in Ag+ species have also been observed, under the simultaneous action of chrono-amperometry and irradiation
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Nelly Couzon. Synthèse et propriétés photoélectrochimiques de nanoparticules d’argent intégrées dans des films d’oxydes mésoporeux. Autre. Université de Lyon, 2018. Français. ⟨NNT : 2018LYSE1171⟩. ⟨tel-02221728⟩

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