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Nanoparticles of lanthanide and transition metal oxysulfides : from colloidal synthesis to structure, surface, optical and magnetic properties

Abstract : The first part of this thesis is dedicated to lanthanide oxysulfides Ln2O2S. In the bibliographic introduction, the history and properties of the bulk compounds are presented. The reaction conditions of the syntheses of Ln2O2S nanoparticles are then detailed. Gd2O2S nanoparticles are obtained via a synthesis in organic medium using Gd(acac)3, S8 and Na(oleate). Unsupported Ce2O2S nanoparticles are obtained for the first time by keeping the nanoparticles under inert atmosphere from the synthesis to the storage. The solid solution between Gd and Ce enables the formation of (Gd,Ce)2O2S nanoparticles. Their surface and their optical and magnetic properties are studied. For the first time, a formation mechanism with nucleation and growth steps is proposed. The alkaline source which is crucial for the crystallization is still debated; the mechanistic study unveiled a new role of formation of oleate aliphatic bilayers. A second part deals with the transition metal oxysulfides. After a quick introduction on the bulk phases, the scarce nanoscaled compounds are presented. The synthesis of Ln2O2S nanoparticles used in the first part is transposed to p- and d- block transition metals. Because of the differences in the coordination modes of the metals, the transposition is challenging but promising results were obtained with several metals. A last chapter is dedicated to the synthesis of nickel sulfides and oxysulfides at ambient temperature using a reactive complex of nickel and S8.
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Submitted on : Sunday, September 27, 2020 - 1:03:09 AM
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  • HAL Id : tel-02950055, version 1

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Clément Larquet. Nanoparticles of lanthanide and transition metal oxysulfides : from colloidal synthesis to structure, surface, optical and magnetic properties. Material chemistry. Sorbonne Université, 2018. English. ⟨NNT : 2018SORUS432⟩. ⟨tel-02950055⟩

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