Controllable Preparation of Fe3o4@Mof-74 and Microwave Absorption Performance Evaluation of Carbonized Derivatives

Abstract

Researchers are constantly trying to exploit the unique advantages of metal-organic framework (MOFs) precursors to develop new composite absorbing materials. Although many magnetic absorbers based on precursor metal central ions have been constructed, there are relatively few reports on the introduction of magnetic components through external aids to enhance the magnetic properties of materials. In this work, Fe 3 O 4 nanoparticles are used for composite with MOF-74 containing Mg 2+ , Ni 2+ , Zn 2+ , Co 2+, and Cu 2+ to construct magnetic particle precursors, which were carbonized to form stable magnetic carbon materials. With the assistance of Fe 3 O 4 nanoparticles, MOF-74 containing different metal central ions fabricates different hierarchical pore structures. The comparative analysis and systematic electromagnetic parameter study show that the composite particles possess excellent interface polarization ability and electromagnetic wave absorption performance due to their specific morphology, reasonable composition and the strengthening effect of magnetic particles. The minimum reflection loss (RL min ) of Fe 3 O 4 @Ni-C reaches -59.4 dB@9.9 GHz, and the effective absorption bandwidth (EAB) of Fe 3 O 4 @Co-C reaches 6.8 GHz@3.1 mm. This work provides an effective route for the design and preparation of magnetic composite carbon absorbers.

Keywords: magnetic composite particle, MOF-74, Fe3O4, porous materials, microwave absorber