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Carbon nanofibers with various contents of Co nanoparticle were synthesized by a two step process of electrospinning and subsequent heat treatment. The thermal stability,phase composition,microstructure and electromagnetic characteristics of the carbon nanofibers were characterized by differential scanning calorimetry-thermogravimmetric analysis (DSC-TGA),X-ray diffraction(XRD),scanning electron microscope(SEM) and vector network analyzer(VNA),and the microwave absorption performance was studied.The results indicate that the crystallinity of composite nanofibers is moderate when the carbonization temperature is 800℃.The amorphous carbon is partially converted into graphite and CoAc2 completely reduces to face-centered cubic structured Co nanoparticle. The fiber is intact and beads-on-string structure exists in the fiber networks. The electromagnetic characteristics of the carbon nanofibers significantly improve by the doping of Co. The Carbon nanofibers containing 7%(mass fraction) as fillers with thickness of 1.5mm exhibit maximum effective absorption bandwidth of 4.5GHz, and it is obviously improved compared to pure carbon nanofibers.

The nanofiber absorbing materials have been research hotspots of high-performance absorbing materials in recent years, owning to its unique surface effect and aeolotropism. As the simplest and effective method of preparing nanofiber, electrospinning has been applied to prepare wave absorbing materials. Many fruitful researches have been done by this means. In this paper, the types and characteristics of absorbing materials prepared by electrospinning are introduced, and the morphology of nanofiber is summarized. In the end, the developing trend and the issues to be resolved of wave absorbing materials prepared by electrospinning are discussed. [ABSTRACT FROM AUTHOR]