Leaf-like CoFe/NC nanomaterials derived from ZIF-67@PBA for enhancing low-frequency microwave absorption

Tuning electromagnetic parameters by modifying magnetic particles is a crucial strategy for enhancing impedance matching and achieving efficient carbon-based microwave absorption materials. In this work, zif-67@PBA was prepared via a ligand exchange method and further subjected to high-temperature treatment to derive a leaf-like CoFe/NC nanocomposite for low-frequency microwave absorption. The original leaf-like zif-67 provides the skeleton structure, while the CoFe-PBA introduced via ligand exchange plays a key role in regulating electromagnetic parameters. This leaflike nanostructure exhibits an excellent dielectric coupling network. The CoFe alloy nanoparticles are uniformly loaded onto the surface of the leaf-like derived carbon. This structural design significantly enhances the magnetic loss capability, thereby improving its impedance matching performance. The results demonstrate that the leaf-like CoFe/NC nanocomposite constructed from a dual-ligand MOF exhibits superior microwave attenuation capability. The RL can reach -64.3 dB in the C-band, and the EAB can achieve 1.80 GHz, covering 45% of the C-band. This composite material has great potential as an electromagnetic absorption device.