Synthèse de nanostructures d'oxyde de cuivre par micro-post-décharge micro-ondes à pression atmospherique

Abstract : Oxidation of copper thin films deposited by magnetron sputtering on silicon and soda-lime glass substrates was performed by means of a microwave micro-afterglow to grow locally controlled nanostructures of copper oxide. The use of plasma discharges offers the possibility to handle oxygen atoms instead of oxygen molecules, which enable a substantial decrease in the synthesis temperature of about 100° typically. It was thus possible to grow hierarchical nanostructures made of nanowalls shaped in balls, nanowall with variable thicknesses, nanowires and nanodots of CuO. These different nanostructures forms successively and are distributed radially from the impact center of the post-discharge outwards. They grow by following parabolic growth rates that are due to a diffusion transport limitation. Outward diffusion occurs and creates a Kirkendall porosity at the substrate-copper interface. TEM analyses do not show any preferential orientation. Nanowires are either mono- or bi-cristals. Compressive (respectively tensile) stress was measured in Cu2O (respectively CuO). The grain size is larger in the center than on the edges of the treatment area. This enables the growth of nanowalls and nanowires with diameters pretty large close to the center whereas a smaller grain size on the edges leads to the formation of thinner nanowires but with higher surface density. The different existing growth models were considered to interpret these new results.
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Ayman Altaweel. Synthèse de nanostructures d'oxyde de cuivre par micro-post-décharge micro-ondes à pression atmospherique. Autre [cond-mat.other]. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0059⟩. ⟨tel-01750767⟩

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