Quaternary nanocomposites consisting of graphene, Fe₃O ₄@Fe Core@Shell, and ZnO nanoparticles: Synthesis and excellent electromagnetic absorption properties

This paper presents for the first time a successful synthesis of quaternary nanocomposites consisting of graphene, Fe₃O₄@Fe core/shell nanopariticles, and ZnO nanoparticles. Transmission electron microscopy measurements show that the diameter of the Fe₃O ₄@Fe core/shell nanoparitcles is about 18 nm, the Fe ₃O₄ shell's thickness is about 5 nm, and the diameter of ZnO nanoparticles is in range of 2-10 nm. The measured electromagnetic parameters show that the absorption bandwidth with reflection loss less than -20 dB is up to 7.3 GHz, and in the band range more than 99% of electromagnetic wave energy is attenuated. Moreover, the addition amount of the nanocomposites in the matrix is only 20 wt %. Therefore, the excellent electromagnetic absorption properties with lightweight and wide absorption frequency band are realized by the nanocomposites.