Efficient microwave absorption of MOFs derived laminated porous Ni@C nanocomposites with waterproof and infrared shielding versatility

Developing high-efficiency electromagnetic wave absorption materials with versatility has been a hotspot and it remains a huge challenge. Here, we reported versatile laminated Ni nanoparticles @ porous carbon (Ni@C) nanocomposites synthesized by a facile carbonization of Ni-based metal-organic frameworks (MOFs) precursor. It was found that the phase components (Ni and C phases) and nano/microstructure (laminated and porous characterizations) were well-modified by controlling the calcination temperature, which led to the variation of the degree of graphitization , magnetic properties , and electromagnetic performances. It showed that the laminated porous Ni@C nanocomposites achieved enhanced microwave absorption performances with a thin thickness of 1.5 mm, a strong reflection loss of −59.8 dB and an effective absorption bandwidth of 4.5 GHz. The underlying microwave absorption mechanism was owing to the improved synergistic effects of polarization relaxation, electron transport , ferromagnetic resonance, as well as multiple reflections and scattering in the laminated porous Ni@C nanocomposites. Furthermore, the multicomponent and laminated porous architecture endowed nanocomposites with favorable waterproof, heat isolation and infrared shielding versatility. Therefore, this work demonstrated a facile approach to develop MOFs-derived versatile laminated porous nanocomposites with efficient microwave absorbing performances.