Fe-MOFs derived porous Fe4N@carbon composites with excellent broadband electromagnetic wave absorption properties

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 Fe4N. 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 Fe4N phase and the porous structure optimize impedance matching, which significantly enhances the electromagnetic wave absorption capacity of the composite. When the Fe4N @ 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. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

Designing components and optimizing structure is an effective strategy to enhance the electromagnetic wave absorption of materials. This study successfully fabricated Fe-metal-organic framework derived iron nitride and carbon-based composites using a two-step method, combining the porous structure of metal-organic frameworks with the excellent electromagnetic properties of Fe4N. The formation of the Fe4N phase and the porous structure optimize impedance matching, significantly enhancing the electromagnetic wave absorption capacity of the composite.