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Élaboration, caractérisation et étude des propriétés de particules cœur-coquilles de diamant

Abstract : Synthetic diamond is now considered in various fields of applications like optics, catalysis, biology or even electronic. Thin films can be synthesized by Chemical Vapor Deposition (CVD) or by High Pressure/ High Temperature (HPHT), while particles are produced by detonation synthesis or milling of bulk diamond. Nevertheless, among all these diamond materials, there is no material available combining sphericity, monodispersity and crystalline quality. This is the purpose of this thesis work. Core-shell systems made of nanocrystalline diamond shell surrounding a silica core have been synthesized, starting from nanodiamond-seeded silica particles. These particles have been grown in a dedicated home-made CVD reactor, specifically developed to treat powders. Varying the gas composition, the nature of the coating has been tuned, from nanocrystalline diamond to a hybrid material made of nanodiamond particles surrounded by organized graphite. Complementary techniques such as Raman spectroscopy and High Resolution Transmission Electronic Microscopy (HR-TEM) have been used to characterize the crystalline structures. Colloidal suspensions were also obtained with these new diamond core-shells, by oxidation of their surface. Dissolving the silica core, diamond shells were also synthesized, exhibiting stable colloidal properties. Preliminary studies on diamond core-shells performances are also presented in this manuscript: their photocatalytic properties toward CO2 reduction and their in-vitro cytotoxicity considering further biological applications. Finally, the manuscript also reports on the extension of the process to magnetic silica cores for the synthesis of magnetic diamond core-shells.
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Submitted on : Thursday, February 21, 2019 - 11:41:07 AM
Last modification on : Wednesday, October 14, 2020 - 4:10:36 AM
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  • HAL Id : tel-02043960, version 1



Amélie Venerosy. Élaboration, caractérisation et étude des propriétés de particules cœur-coquilles de diamant. Science des matériaux [cond-mat.mtrl-sci]. Université Paris Saclay (COmUE), 2018. Français. ⟨NNT : 2018SACLS514⟩. ⟨tel-02043960⟩



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