Fe3O4 nanospheres deposited on Prussian blue analogue-derived Ni-Co/CNTs networks for electromagnetic wave absorption

In the current work, Ni-Co/CNTs networks were firstly produced by a simple annealing treatment of NiCo PBA, which was then used as a carbon-based carrier and successfully deposited Fe3O4 nanospheres via a classic hydrothermal reaction process. Additionally, the electromagnetic wave absorption performances of composites could be effectively affected by adjusting the mass ratio of the Fe3O4 nanoparticles. The minimum reflection loss (RLmin) of −48.76 dB was achieved for Fe3O4@Ni-Co/CNTs-1# at 3.5 mm thickness. Meanwhile, Fe3O4@Ni-Co/CNTs-2# exhibited a wide effective absorption band (EAB) of 5.9 GHz (12.1–18 GHz) at a 2.0 mm matching thickness, suggesting that the Fe3O4@Ni-Co/CNTs composites were a promising absorber for electromagnetic wave absorption materials. Based on the synergistic effects of dielectric and magnetic losses generated by Ni-Co/CNTs and Fe3O4, respectively, and appropriately matched impedances, a new strategy for fabricating lightweight, thin-thickness, strong absorption, and wide-bandwidth materials was provided.