Multifunctional three-dimensional porous MOFs derived Fe/C/carbon foam for microwave absorption, thermal insulation and infrared stealth

Multifunctional microwave absorbing materials with properties of high absorbing performance, infrared stealth, thermal insulation are urgently required to cope with current complex and extreme electromagnetic environment. To solve this problem, a three-dimensional carbon foam (CF) was used as a matrix, and Fe/C nanocubes derived from Prussian Blue (PB) were uniformly distributed throughout the CF skeleton. Such design of Fe/C/CF porous structures enhanced the synergistic effects between dielectric and magnetic loss to reach a better absorbing performance. The minimum reflection loss (RL) of hybrid foam is −66.7 dB, and the widest effective absorbing bandwidth (EAB, RL < −10dB) is 6.34 GHz. Moreover, the hybrid foam showed remarkable infrared stealth and thermal insulation properties. The surface temperature of hybrid foam almost unchanged while it was heated under 100 °C for more than 1 h. It is noteworthy that the preparation process of hybrid foam was a facile, recycled, and low-cost strategy for achieving high-performance absorbing materials. Besides, the mentioned methods may provide inspirations for the preparation of high-performance microwave absorbing materials and increase the potential application fields in complex actual scenarios.