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Communication dans un congrès


Abstract : Nanostructured systems based on heteroepitaxial islands (noble metals, transition magnetic metals, functional oxides, etc.) grown onto oxide surfaces (MgO, ZnO, Al2O3, etc.) are attracting intensive interest due to both the fundamental significance and potential application in optics, electronics, spintronics, and magnetic data storage. In such nanosystems, the control of the atomic structure, the shape, and the size of the islands is of prime importance in determining the overall physical properties. In addition, many of the applications so far envisaged also require precise arrangement of these structures into ordered arrays. In the present work, we aim at producing self-organized nanostructures in a two-step process. The first step consists in the preparation of suitable templates by thermally activated surface diffusion on vicinal surface of oxide single-crystals. Such templates should be chemically and structurally stable over long periods of time and in various environments (air, vacuum, high temperatures...) so as to be compatible with various deposition processes. In the second step, nanoparticles will be grown on these templates using different techniques (sol-gel, chemical vapor deposition (CVD) and sputtering). Vicinal substrates of sapphire with miscut angle of 5 and 10° from the (001) planes towards the direction have been annealed in air or in Ar atmosphere in the range from 1000 to 1500 °C. The behaviour of these surfaces has been characterized as a function of the temperature, the thermal treatment time, and the thermal annealing atmosphere by Atomic Force Microscopy observations. A thermal treatment at 1250 °C allows to stabilize a surface made of periodically spaced nanosized step-bunches. Such stepped surfaces were used as template to grow self-patterned epitaxial oxide nanoparticles by thermal annealing of yttria-stabilized zirconia thin films produced by sol-gel dip-coating. Grazing Incidence Small Angle X-ray Scattering and High-Resolution Transmission Electron Microscopy were used to study the morphology of the nanoparticles and their epitaxial relationships with the substrate.
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Communication dans un congrès
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Contributeur : Elsa Thune Connectez-vous pour contacter le contributeur
Soumis le : vendredi 3 mars 2017 - 16:00:51
Dernière modification le : samedi 26 mars 2022 - 04:28:04


  • HAL Id : hal-01482496, version 1



Elsa Thune, Alexandre Boulle, W. Hamd, D. Babonneau, Ahmad Fakih, et al.. NANOSTRUCTURED SAPPHIRE VICINAL SURFACES AS TEMPLATES FOR THE GROWTH OF SELF-ORGANIZED OXIDE NANOSTRUCTURES. 34th International Conference and Expo on Advanced Ceramics and Composites (ICACC’10), The American Ceramic Society, Jan 2010, Daytona Beach, United States. ⟨hal-01482496⟩



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