Effect of nitrogen-doped reduced graphene oxide on the wave-absorbing properties of hollow ZnFe₂O₄

The mitigation of electromagnetic wave pollution is a pressing concern that can be addressed by the effective utilization of microwave-absorbing materials characterized by low density, thin thickness, wide absorption bandwidth, and robust absorption strength. This work used a two-step solvent-thermal and hydrothermal approach to create nitrogen-doped reduced graphene oxide (NRGO)/ZnFe₂O₄ hollow-structured composite microwave absorbent materials. The study of its microstructure reveals that the flaky NRGO is well adhered to the hollow ZnFe₂O₄ with a rough surface. The findings indicate that the electromagnetic wave absorption characteristics of NRGO/ZnFe₂O₄ are influenced by the variable contents of NRGO. At the NRGO doping level of 15%, the NRGO/ZnFe₂O₄ composites exhibit the best electromagnetic wave absorption capabilities. With the matching thickness of 4.91 mm, the minimum reflection loss (RL_min) can approach − 59.95 dB. This study serves as a significant point of reference for the development of highly effective electromagnetic wave absorption materials using graphene.