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Élaboration de nanoparticules d’alliages métalliques par décharges impulsionnelles nanosecondes dans l’azote liquide

Abstract : This work is limited to the synthesis of nanoparticles by discharges generated in a non-reactive liquid, namely liquid nitrogen. Depending on the types of electrodes used and the experimental conditions, the use of liquid nitrogen actually makes it possible to preserve the metallic nature of the nanoparticles and even to consider forming alloys using electrodes of different metals. This work therefore contributes to improving our knowledge of the formation of metallic nanoparticles in a medium considered inert, which simplifies the interpretation of spectroscopic analyzes, and to demonstrate the viability of such a process for potential applications in catalysis or photonics. . We chose two study systems: Cadmium-Silver and Cobalt-Nickel. The advantage of the first is to form defined compounds which easily allow positioning in the phase diagram, and which, in the event of the formation of alloys, would allow easy understanding of changes in the composition of the particles formed. It is quite similar to the Copper-Zinc system, and therefore allows a direct comparison with this system in order to verify in particular the similarity of their behavior. We will see that it is not. Finally, in a more prospective manner, we are also seeking to form alloy nanoparticles that are out of equilibrium, i.e. not compatible with the phase diagram associated with them, with the aim of obtaining new properties.
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https://hal.univ-lorraine.fr/tel-02960464
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Submitted on : Wednesday, October 7, 2020 - 5:06:00 PM
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  • HAL Id : tel-02960464, version 1

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Mahmoud Trad. Élaboration de nanoparticules d’alliages métalliques par décharges impulsionnelles nanosecondes dans l’azote liquide. Matériaux. Université de Lorraine, 2020. Français. ⟨NNT : 2020LORR0074⟩. ⟨tel-02960464⟩

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