Preparation of MOFs-derived Ni/NPC materials and absorption properties

In order to solve the problems of electromagnetic pollution, it is urgent to prepare excellent microwave absorbing materials. A solvent-thermal method is employed to synthesize the precursor Ni-MOF-74, followed by carbonization treatment at different temperatures to prepare Ni/NPC material with a porous carbon encapsulation structure. The results indicate that, with the variation of carbonization temperature, the absorption performance of Ni/NPC composite material reaches its optimum at 700 ℃. At a frequency of 17.36 GHz, the minimum reflection loss is −38.4 dB, and the effective absorption bandwidth is 2.61 GHz (15.39–18 GHz). Studies on the absorption mechanism reveal that multiple reflections of electromagnetic waves, interface polarization losses, and resonance are the main contributing factors to the enhancement of absorption performance.