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Nanoparticules d'or bi-fonctionnelles : dynamique et hétérogénéité dans les systèmes hybrides

Abstract : This thesis shows the synthesis and the characterization of bi-functional gold nanoparticles. Several synthesis of spherical gold nanoparticles are presented in order to obtain nanoparticles with a diameter of 2 nm, 5 nm, 15 nm or 35 nm. The ligand shell can become bi-functional from two processes: bi-ligand synthesis or ligand exchange. In both cases, the composition of the ligand shell is studied by nuclear magnetic resonance and is shown to be systematically different from the reaction medium’s composition, each ligand introducing particular intermolecular interactions which provide it proper complexing abilities against the gold surface. The ligand segregation on the surface is studied thanks to regioselective heterogeneous nucleation of silica, leading to the formation of asymmetric gold/silica nanostructures, thus revealing a phase separation of the ligands in certain cases. Then, a particular influence of aromatic ligands on the optical properties of the gold nanoparticles is observed, showing a strong shift of the localized surface plasmon band to higher wavelengths. A theorical study shows the influence of this kind of ligands on the gold interband transitions in the nanoparticles.Keywords: gold nanoparticles, functionnalization, ligand exchange, segregation, gold/silica hybrid nanostructures, plasmonics, nuclear magnetic resonance.
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Submitted on : Saturday, December 10, 2016 - 1:03:12 AM
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  • HAL Id : tel-01413597, version 1


Claire Goldmann. Nanoparticules d'or bi-fonctionnelles : dynamique et hétérogénéité dans les systèmes hybrides. Physique Nucléaire Théorique [nucl-th]. Université Pierre et Marie Curie - Paris VI, 2014. Français. ⟨NNT : 2014PA066372⟩. ⟨tel-01413597⟩



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