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<dc:title xml:lang="en">First-principle modeling of carbon-based materials for electronic-magnetic application</dc:title>
<dcterms:alternative xml:lang="fr">Étude de composites systèmes carbonés-métaux ferromagnétique par simulations ab-initio</dcterms:alternative>
<dc:subject xml:lang="fr">Dynamique moléculaire ab initio</dc:subject>
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<tef:elementdEntree autoriteExterne="031778526" autoriteSource="Sudoc">Nanoparticules</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">La question centrale ayant guidé ce travail est la suivante : disposons-nous aujourd’hui des outils de simulation et des capacités technologiques nécessaires pour prédire et comprendre les performances réelles des matériaux carbonés à l’échelle nanométrique ? Pour y répondre, trois systèmes représentatifs ont été étudiés : des nanotubes de carbone (CNT) décorés de cobalt, des CNT en interaction avec le polymère PMMA, et le graphène oxyde réduit (rGO). Ces systèmes, choisis pour leur pertinence scientifique et industrielle, ont permis d’explorer les mécanismes d’interaction aux échelles atomique et électronique. Les simulations ont été réalisées dans le cadre de la dynamique moléculaire ab initio (FPMD), afin de décrire finement les comportements atomiques, électroniques et vibrationnels. À partir des trajectoires obtenues, plusieurs approches complémentaires ont été mises en œuvre : le théorème fluctuation–dissipation pour l’accès aux réponses diélectriques et électromagnétiques, les fonctions de Wannier maximales (MLWF) pour l’analyse des moments dipolaires locaux, ainsi que des méthodes perturbatives basées sur les matrices dynamiques pour caractériser et visualiser les modes vibrationnels.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The central question guiding this work is the following: do we currently have the simulation tools and technological capabilities required to predict and understand the actual performance of carbon-based materials at the nanometric scale ? To address this question, three representative systems were investigated: cobalt-decorated carbon nanotubes (CNTs), CNTs interacting with the polymer PMMA, and reduced graphene oxide (rGO). These systems, selected for their scientific and industrial relevance, made it possible to explore interaction mechanisms at the atomic and electronic scales. The simulations were carried out within the framework of ab initio molecular dynamics (FPMD) in order to accurately describe atomic, electronic, and vibrational behaviors. Based on the resulting trajectories, several complementary approaches were employed: the fluctuation–dissipation theorem to access dielectric and electromagnetic responses, maximally localized Wannier functions (MLWFs) to analyze local dipole moments, and perturbative methods based on dynamical matrices to characterize and visualize vibrational modes.</dcterms:abstract>
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