Fully Crystalline Faceted Fe-Au Core-Shell Nanoparticles

Cyril Langlois (1) , Patrizio Benzo (2) , R. Arenal (3) , Magali Benoit (2) , Julien Nicolaï (1) , Nicolas Combe (2) , Anne Ponchet (2) , Marie-José Casanove (2)

1 CEMES - Centre d'élaboration de matériaux et d'études structurales
2 CEMES-SINanO - Surfaces, Interfaces et Nano-Objets
3 Laboratorio de Microscopías Avanzadas

Fe-Au core-shell nanoparticles displaying an original polyhedral morphology have been successfully synthesized through a physical route. Analyses using transmission electron microscopy show that the Au shell forms truncated pyramids epitaxially grown on the (100) facets of the iron cubic core. The evolution of the elastic energy and strain field in the nanoparticles as a function of their geometry and composition is calculated using the finite-element method. The stability of the remarkable centered core-shell morphology experimentally observed is attributed to the weak elastic energy resulting from the low misfit at the Fe/Au (100) interface compared to the surface energy contribution.

Mots clés: Elasticity; Electron microscopy; Finite element method; Gold; High resolution transmission electron microscopy; Nanoparticles; Synthesis (chemical); Shells (structures); Transmission electron microscopy; Core-shell morphologies; Core-Shell Nanocrystals; Core-shell nanoparticles; Epitaxially grown; Equilibrium structures; Polyhedral morphologies; Surface energy contribution; Truncated pyramids

Domaines: Physique [physics]

Cyril Langlois, Patrizio Benzo, R. Arenal, Magali Benoit, Julien Nicolaï, et al.. Fully Crystalline Faceted Fe-Au Core-Shell Nanoparticles. Nano Letters, 2015, 15 (8), pp.5075-5080. ⟨10.1021/acs.nanolett.5b02273⟩. ⟨hal-01765161⟩