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Hybrid semiconducting nanoplatelets : synthesis and molecule-driven assembly

Abstract : This Ph.D. aimed at a better understanding of the chemical properties of cadmium selenide nanoplatelets by functionalization by paramagnetic coordination complexes. Indeed, the original optical properties of the platelets associated to the paramagnetism of transition metal complexes could lead to new magneto-optic properties. In agreement with recent literature results, this Ph.D. confirms that the planar morphology of these nano-objets induces their stacking when covered by appropriate ligands and dispersed in appropriate solvents. This thesis presents three chapters about (i) the description of the structure and the properties of CdSe nanoplatelets, (ii) a study of azobenzenedecorated nanoplatelets and (iii) the self-assembly of CdSe nanoplatelets mediated by cobalt(II) phtalocyanines to produce composite materials. This work shows that functionalizing CdSe nanoplatelets with azobenzene moieties allows their out-of-equilibrium assembly. Furthermore, two ways of assembling nanoplatelets with cobalt(II) phtalocyanines have been developed leading to composites bearing different structures. For one of these structures a circularly polarized light is emitted under magnetic field revealing a symmetry braking in the composite thanks to the cobalt complex and thus magneto-optic effects.
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  • HAL Id : tel-02946263, version 1

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Yesica Flores. Hybrid semiconducting nanoplatelets : synthesis and molecule-driven assembly. Coordination chemistry. Sorbonne Université, 2018. English. ⟨NNT : 2018SORUS464⟩. ⟨tel-02946263⟩

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