Reduced Magnetism in Core–Shell Magnetite@MOF Composites

Abstract

The magnetic susceptibility of synthesized magnetite (Fe₃O₄) microspheres was found to decline after the growth of a metal-organic framework (MOF) shell on the magnetite core. Detailed structural analysis of the core-shell particles using scanning electron microscopy, transmission electron microscopy, atom probe tomography, and⁵⁷Fe-Mössbauer spectroscopy suggests that the distribution of MOF precursors inside the magnetic core resulted in the oxidation of the iron oxide core.