Abstract
Designing components and optimizing structure is considered an effective strategy to enhance the electromagnetic wave absorption of materials. In this study, a two-step method was successfully used to fabricate Fe-metal-organic framework derived iron nitride and carbon-based composites, which combined the porous structure of metal-organic frameworks with the excellent electromagnetic properties of Fe 4 N. By comparing the composite samples' morphology, structure, composition characteristics, and electromagnetic properties before and after nitriding, reasons for improving electromagnetic wave absorption performance are revealed. The formation of the Fe 4 N phase and the porous structure optimize impedance matching, which significantly enhances the electromagnetic wave absorption capacity of the composite. When the Fe 4 N @ carbon composite has a matching thickness of 2 mm, the minimum reflection loss reaches − 56 dB, and when the matching thickness is 2.5 mm, the reflection loss reaches − 42 dB at 13.4 GHz. The effective absorption bandwidth reaches 6.7 GHz. This research brings a new design scheme for improving electromagnetic wave absorption materials. • Fe 4 N @ C composite derived from Fe-metal organic framework was synthesized. • The porous structure and the synergy of dielectric and magnetic loss contribute to electromagnetic wave absorption. • The RL min is − 56 dB with a thickness of 2 mm, and effective absorption bandwidth of 6.7 GHz can be reached with 2.5 mm. • Multiple attenuation mechanisms of the Fe 4 N @ C composite are clarified.
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