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

• Published in: Journal of materials science. Materials in electronics 2023-06, Vol.34 (18), p.1404, Article 1404
• Main Authors: Li, Chaojie, Feng, Yonghang, Cui, Yi, Zhang, Fan, Lv, Dongfeng, Liu, Pan, Wei, Yingna, Wei, Hengyong, Bu, Jinglong
• Format: Article
• Language: English
• Subjects: Carbon fibers; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composite materials; Dielectric loss; Dipoles; Ethanol; Fibers; Laboratories; Materials Science; Microwave absorption; Morphology; Nickel compounds; Optical and Electronic Materials; Pore size; Surface chemistry; Synergistic effect; Thermal reduction; X ray photoelectron spectroscopy
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-023-10828-6

The NiCo 2 O 4 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 NiCo 2 O 4 nanoflakes/SiC fibers composites were successfully prepared. The NiCo 2 O 4 nanoflakes were generated on the surface of SiC fibers with uniform distribution and loose structure. The NiCo 2 O 4 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 NiCo 2 O 4 nanoflakes/SiC fibers composites. Therefore, the reflection loss of NiCo 2 O 4 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.