Controlling the Sulfidation Process of Iron Nanoparticles: Accessing Iron−Iron Sulfide Core-Shell Structures
Résumé
Surface sulfidation of iron nanoparticles with hydrogen sulfide yields structurally well‐defined core–shell systems exhibiting an iron core and an iron sulfide shell. According to Mößbauer studies the shell′s chemical composition is best described as a mixture of Fe1‐X S, Fe2S2, and Fe7S8. Magnetic measurements reveal the partially preserved ferromagnetic character of the core–shell particles, which is also reflected in substantial magnetic heating properties of the material.