Biconical prisms Ni@C composites derived from metal-organic frameworks with an enhanced electromagnetic wave absorption

Metal-organic frameworks (MOFs) derived metal/carbon composites are considered as feasible highperformance electromagnetic wave absorption materials and have received considerable attention. Herein, biconical prisms Ni@C composites were fabricated via a simple carbonization of Ni-MOFs template. It was found that the core-shell biconical prisms Ni@C composites achieved an optimization of the impedance matching and an efficient microwave absorption performance by regulating the carbonization temperatures. As expected, the Ni@C composites obtained a stronger reflection loss of-52.9 dB at the matching thickness of 2.4 mm and covered an effective absorption bandwidth of 4.6 GHz with 2.0 mm thickness. The enhanced electromagnetic wave absorption performance resulted from the synergistic effect of the magnetic resonance, relaxation polarization, conductive loss, and multiple scatterings/reflections, which were generated by the nickel nanoparticles, carbon, CNT, the novel structure of core-shell Ni@C, and the carbon nanotubes wrapped biconical prisms Ni@C composites. In summary, our work introduced a facile paradigm for the development of MOFs-derived composites as enhanced electromagnetic wave absorption materials. (c) 2021 Elsevier Ltd. All rights reserved.