LAUSR

In this work, the hierarchical NiCo2O4 self-assembled by lamellar flakes were successfully synthesized by a simple solvothermal route and subsequent thermal treatment. The composition and microstructure of the hierarchical NiCo2O4 were characterized by XRD and SEM, respectively. The microwave absorption properties were also evaluated. An optimum reflection loss (RL) of − 45.5 dB at 4.6 GHz with a composite thickness of 4.2 mm and effective bandwidth (RL < − 10 dB) of 7.7 GHz were obtained. The excellent electromagnetic wave absorption property of the hierarchical NiCo2O4 is due to the conduction loss and dielectric loss of NiCo2O4, the hierarchical structure could also enhance the microwave absorbing properties by the strong multi-reflections and scattering of microwave between stacking layers.