Femtosecond Laser Fabrication of Plasmonic-Magnetic Ni-Au Nanoparticles with Enhanced Magnetic Properties
Résumé
Bimetallic nanoparticles, particularly Ni-Au, exhibit unique magneto-optical properties that can be fine-tuned through careful control of their morphology and composition. Femtosecond lasers have shown great promise in achieving these modifications. Specifically, Ni-Au nanoparticles demonstrate enhanced mixing and alloying under rapid heating, resulting in the formation of nanocomposites with diverse sizes, shapes, and compositions. The catalytic properties of the considered nanoparticles have also been extensively studied, with findings suggesting that their improved catalytic performance may arise from the incorporation of Ni into the gold surface, as well as from surface lattice relaxation and subsurface misfit defects. In this study, we investigate the mechanisms underlying laser-induced synthesis of Ni-Au nanoparticles through both experimental and numerical approaches. Ni and Au nanoparticles were produced via femtosecond laser ablation in liquids, with the choice of solvent, such as water or ethanol, significantly influencing the outcomes. To gain deeper insights into the processes involved, detailed atomistic simulations were conducted, revealing the conditions that favor size reduction and enhance the magnetic properties of these nanoparticles.
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