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Nanocomposites plasmoniques anisotropes à base de copolymères à blocs et de nanoparticules d'or

Abstract : Nanochemistry and self-assembly are promising ways to fabricate nanostructured materials with innovative optical properties in visible light. In this work, anisotropic plasmonic nanocomposites are formulated by selectively introducing metallic nanoparticles in ordered phases of symmetric dibloc copolymers with different strategies. For the strategy of post-incorporation, pre-synthesized gold nanoparticles in aqueous medium are selectively introduced in pre-ordered phases of an amphiphilic dibloc copolymer. Direct incorporation consists in mixing pre-synthesized gold nanoparticles and dibloc copolymer in a common solvent. In situ synthesis of nanoparticles consists in reducing metallic precursors previously introduced in one of two blocks of a copolymer via a reduction step. The influence of the size and the volume fraction of gold nanoparticles on the nanostructure and the optical properties of the nanocomposite films have been particularly studied. Morphology of macroscopic films is studied by transmission electron microscopy and small angle X-ray scattering. The nanocomposite thin films are structurally characterized by force atomic microscopy, transmission electron microscopy and X-ray reflectivity. The optical indices obtained by spectroscopic ellipsometry can be described with Maxwell-Garnett models, which can take into account phenomenologically the effects of coupling between gold nanoparticles.
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Submitted on : Wednesday, April 3, 2013 - 3:39:54 PM
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Clémence Tallet. Nanocomposites plasmoniques anisotropes à base de copolymères à blocs et de nanoparticules d'or. Chimie théorique et/ou physique. Université Sciences et Technologies - Bordeaux I, 2012. Français. ⟨NNT : ⟩. ⟨tel-00807461⟩

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