Heterostructure design of Fe3N alloy/porous carbon nanosheet composites for efficient microwave attenuation

The self-dissipation and attenuation capacity of materials play an important role in realizing efficient electromagnetic absorption, in this case, the roles of macroscopic composition and micro-structure should be emphasized simultaneously in the reasonable design of microwave absorbent. Given that, Fe3N alloy embedded in two-dimensional porous carbon composites were fabricated via facile sol-gel and sacrificial template methods. Satisfactorily, the magnetic/dielectric materials combination and porous structure introduction are conductive to the optimization of impedance matching property, as result of the enhancement of microwave absorption capacity. In addition, sufficient magnetic loss capacity, strong conductivity as well as polarization attenuation bring about the outstanding microwave absorbing performance with an effective absorption bandwidth of 6.76 GHz and a minimum reflection loss value of -65.6 dB. It is believed that this work not only lay a foundation to achieve microwave response materials in a wide frequency range, but also emphasize the significant role of the component selection and structural design. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

Automated summary

The combination of magnetic/dielectric materials and introduction of porous structure contribute to the optimization of impedance matching property, enhancing microwave absorption capacity. The Fe3N alloy embedded in two-dimensional porous carbon composites fabricated in this study exhibits outstanding microwave absorbing performance.