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<dc:title xml:lang="en">Advanced 3D and in-situ TEM approaches applied to carbon-based and zeolitic nanomaterials</dc:title>
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<dc:subject xml:lang="en">Electron microscopy</dc:subject>
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<tef:elementdEntree autoriteExterne="027404269" autoriteSource="Sudoc">Microscopie électronique en transmission</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Dans le cadre de cette thèse, des techniques avancées de Microscopie électronique à transmission (MET)ont été utilisées dans le but de caractériser et de fabriquer de nouveaux nanomatériaux pour des applications dans les domaines de la nanoélectronique et de la catalyse. Trois types de matériaux fonctionnalisés sont étudiés: le graphène multifeuillets (FLG– Few-Layer Graphene) avec des nanomotifs,des nanotubes de carbone (CNTs - Carbon Nanotubes en anglais) et des zéolithes mésoporeux. La formation de nanomotifs de tranchées et de tunnels sur des flocons de FLG à l’aide de nanoparticules(NPs) de fer est étudiée dans une approche qui combine la tomographie électronique et la MET environnementale. Le rôle des facettes de la nanoparticule et des paramètres topographiques de FLG a été déterminé du point de vue quantitatif, ce qui a mené à la mise en évidence du mécanisme de formation des nanomotifs de tranchées et de tunnels. Le transfert de nanoparticules à base de métal entre deux nanostructures de carbone a été également étudié, en temps réel, en employant un porte-échantillon MET couplé avec un dispositif STM (Scanning Tunneling Microscope en anglais). Le protocole de contrôle du transfert des nanoparticules, les transformations chimiques et structurales subies par celles-ci, le mécanisme de croissance de nouvelles nanoparticules et d’autres phénomènes liés à ces effets ont été étudiés avec attention. La dernière partie de la thèse est centrée sur l’étude de la tomographie électronique à faible dose de la porosité induite dans deux classes de zéolithes, ZSM-5 et zéolithe Y, en utilisant un traitement chimique novateur à base de fluor.</dcterms:abstract>
<dcterms:abstract xml:lang="en">In this thesis, advanced Transmission Electron Microscopy (TEM) techniques are used to characterize and fabricate new nanomaterials with applications in nanoelectronics and catalysis. Three types of functionalized materials are investigated: nanopatterned few-layer graphene (FLG), carbon nanotubes(CNTs) and mesoporous zeolites. The nanopatterning process of FLG flakes by iron nanoparticles (NPs) is studied using an approach combining electron tomography (ET) and environmental TEM. The role of the nanoparticle faceting and of the FLG topographic parameters has been quantitatively determined leading to the first determination of the operating mechanism of the patterning process. The mass transfer of metallic-based NPs between two carbon nanostructures was studied as well in real-time by using a TEMSTMholder. The protocol of controlling the mass transfer, the chemical and structural transformations of the NPs, the growth mechanism of the new NPs and other related phenomena were carefully investigated.The last part deals with the low-dose ET investigation of the porosity induced in two classes of zeolites,ZSM-5 and zeolite Y, by an innovative fluoride-based chemical treatment.</dcterms:abstract>
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