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Article Dans Une Revue European Physical Journal: Applied Physics Année : 2022

Self-organization mechanisms in a Fe-Au film: from isolated core-shell to multicore nanoparticles

Résumé

Many nanotechnological applications necessitate a high density of nanoparticles (NPs), making NP morphology control highly challenging. In this work, the morphology of bimetallic NPs formed by magnetron sputtering deposition of a Fe(3 nm)-Au(2 nm) bilayer film on an amorphous silica substrate is analyzed using high-angle dark-field scanning transmission electron microscopy (HAADF-STEM). While all the NPs adopt a Fe-Au core-shell chemical order, they can be sorted into three different types. Isolated NPs, displaying either a highly symmetric centered core geometry (CC-type) or an asymmetrical off-centered core geometry (OC-type), are observed despite the rather large metallic volume. The majority of the NPs however displays a multicore geometry, with Fe cores in the 10-12 nm range, larger than the NPs observed in a pure Fe (3nm) film grown under identical conditions. The driving forces leading to the different morphologies are discussed together with the role played by the environnement.
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Origine : Publication financée par une institution

Dates et versions

hal-03685120 , version 1 (01-06-2022)

Identifiants

Citer

Ségolène Combettes, Teresa Hungria, Sophie Barre, Béatrice Pecassou, Robin Cours, et al.. Self-organization mechanisms in a Fe-Au film: from isolated core-shell to multicore nanoparticles. European Physical Journal: Applied Physics, 2022, 97, pp.27. ⟨10.1051/epjap/2022220026⟩. ⟨hal-03685120⟩
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