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Theses

Matériaux Nanohybrides à Large Bande Interdite: Études de Synthèses, Propriétés et Applications

Abstract : My thesis consists on the design of dye-functionalized ZnO nanoparticles and the investigation of their optical and morphological properties, and electronical interactions between the inorganic ZnO and the organic dye molecules. We produced Nanohybrids based on spherical and rod-like ZnO templates via two routes: Femtosecond laser ablation in liquid medium and Solution-based chemical procedures. Spherical particles of few nanometers were generated by laser ablation revealing by photoluminescence the effect of quantum confinement due to size reduction. Excitation exchange from the ablated ZnO core towards the grafted dye molecules is detected via one- and two-photon excitations. The chemically-synthesized ZnO rod-growth occurs through Oswald repining and oriented attachment. These growth modes were monitored depending on synthesis time reaction and reactant nature by the High Resolution Transmission Electron Microscope (HRTEM). Optical properties of the hybrid samples strongly depend on the ZnO shapes as well as on the adsorbed dye type and concentration. We were able to engineer the band gap of the small ZnO particles in the nanohybrid matrices simply upon varying the dye concentration. We showed thus the quantum confinement effect through induced charged layers in the ZnO due to the adsorbed porphyrin dyes of COOH anchoring groups.
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https://tel.archives-ouvertes.fr/tel-00266833
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Submitted on : Tuesday, March 25, 2008 - 3:50:32 PM
Last modification on : Tuesday, October 20, 2020 - 3:10:24 AM
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Aurore Said. Matériaux Nanohybrides à Large Bande Interdite: Études de Synthèses, Propriétés et Applications. Physique [physics]. Université de la Méditerranée - Aix-Marseille II, 2007. Français. ⟨tel-00266833⟩

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