Synthesis and microwave absorption properties of NiCo₂O₄ nanoflakes/SiC fibers composites

The NiCo2O4 nanoflakes/SiC fibers composites were prepared by electrospinning, carbon thermal reduction combined with hydrothermal method. The results of SEM, XRD and XPS suggested that the NiCo2O4 nanoflakes/SiC fibers composites were successfully prepared. The NiCo2O4 nanoflakes were generated on the surface of SiC fibers with uniform distribution and loose structure. The NiCo2O4 nanoflakes/SiC fibers composites possess the porous structure and their BET specific surface area is 233.2 m(2)/g. The BJH average pore size and the pore volume are 7.0 nm and 0.4 cm(3)/g, respectively. The structure of fibers and pores can bring the multiple reflections and scatterings, interface polarizations, dipole polarizations and conductivity losses. In addition, there is the synergistic effect of dielectric loss and the magnetic loss in NiCo2O4 nanoflakes/SiC fibers composites. Therefore, the reflection loss of NiCo2O4 nanoflakes/SiC fibers composites could achieve - 56 dB under the thickness of 6 mm at 17.64 GHz, which showed the better microwave absorption behavior than SiC fibers.