期刊
PHYSICA B-CONDENSED MATTER
卷 561, 期 -, 页码 16-22出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2019.02.045
关键词
Electrospinning; Ferrites; Sol-gel; Electromagnetic properties
资金
- National Natural Science Foundation of China [21301040]
CoFe2O4 fibers and particles were prepared by directly annealing electrospun citric acid-based precursor fibers and dried precursor gel under protective atmosphere, respectively. Their electromagnetic parameters were measured and CoFe2O4 nanofibers exhibit excellent microwave absorption performance. When the matching thickness of CoFe2O4 fibers is 3 mm, the bandwidth corresponding to reflection loss below -10 dB (over 90% microwave absorption) can reach 10.0 GHz and cover the entire X-band and Ku-band. Typical Cole-Cole semicircles suggest that both CoFe2O4 particles and fibers have multiple dielectric relaxation processes. The nano-confinement of the electrospun CoFe2O4 fibers can result in an improved mutual interfacial polarization. For the intrinsic shape anisotropy of the fibrous structure, CoFe2O4 fiber with higher coercivity increases the magnetic loss. Based on comprehensive experimental investigation, the relationship between the microwave energy loss and the morphology of CoFe2O4 is discussed.
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