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Etude par les techniques avancées de microscopie électronique en transmission de matériaux fragiles

Abstract : The present manuscript shows the importance of methodological and technical development to identify and to unblock locks preventing the analysis of hybrid and complex materials that undergo degradation under electron beam irradiation. We have shown that beam-induced damage to the sample only appears above some specific threshold of current density. Such a threshold depends on the nature of the material and on its morphological and structural characteristics. These developments in synergy with the use of Cryo-EM, allowed us to expose the architecture of carbon-based hybrid materials, measure the variation of the lamellar distance in a perovskite according to the molecular spacer and to the positioning of the metal, identify the interactions at the interface between two molecular crystals, and the 3D quantification of the functionalization within a MOF. Lastly, we brought to light the processes of nucleation and growth of iron oxide by in-situ liquid phase TEM.
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Dris Ihiawakrim. Etude par les techniques avancées de microscopie électronique en transmission de matériaux fragiles. Matière Condensée [cond-mat]. Université de Strasbourg, 2019. Français. ⟨NNT : 2019STRAE005⟩. ⟨tel-02464449⟩

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