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Nanostructuration bidimensionnelle de surfaces vicinales de saphir : Etude quantitative par diffusion et diffraction des rayons x sur sources de lumière synchrotron

Abstract : Nanostructured systems based on nanoparticles deposited onto oxide surfaces have both a fundamental and technological interests. Final properties of such systems depend mostly on the shape and size of the nanoparticles and also on their spatial organization on the surface. In this general context, the use of vicinal surfaces appears to be an interesting way of producing templates for ordering nanoparticles. This work is devoted to the study of two-dimension (2D) nanostructuration of sapphire vicinal surfaces obtained under specific experimental conditions (vicinal surface orientation and thermal treatment parameters). The main objectives of this study were to describe the surface morphology of the samples having the 2D ordering and also to propose a mechanism regarding the transition from the 1D to the 2D ordering.Morphology of sapphire vicinal surfaces, annealed at 1250 °C under pure oxygen atmosphere during various durations up to 380 h, was studied by complementary technics: atomic force microscopy (AFM), grazing-incidence small-angle X-rays scattering (GISAXS), and grazing-incidence X-rays diffraction (GIXD). Results allowed us to describe the 2D ordered surface by being an assembly of pyramids with an isosceles triangle base decorating a rectangular centered lattice. The shape of those irregular tetrahedrons has been precisely determined with the crystallographic characteristics of sapphire. It has also been shown that a meandering step-edge phenomenon is probably the starting point of the transition between 1D and 2D lattices obtained when initial step-edges are straight.
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Submitted on : Thursday, September 8, 2016 - 6:18:08 PM
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Caroline Matringe. Nanostructuration bidimensionnelle de surfaces vicinales de saphir : Etude quantitative par diffusion et diffraction des rayons x sur sources de lumière synchrotron. Matériaux. Université de Limoges, 2016. Français. ⟨NNT : 2016LIMO0032⟩. ⟨tel-01362465⟩

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