Fiber-guided and particle-localized microwave absorption of nanoscale CoFe2O4 derived from citric acid-based precursor

被引：19

作者：

Li, Jianjun ^{[1
]}

Feng, Yizhe ^{[1
]}

Wu, Yanfeng ^{[1
]}

Yuan, Ye ^{[2
]}

机构：

[1] Harbin Inst Technol, Natl Key Lab Sci & Technol Adv Composites Special, Harbin 150080, Heilongjiang, Peoples R China

[2] Hebei Univ Technol, Sch Mat Sci & Technol, Res Inst Energy Equipment Mat, Tianjin 300401, Peoples R China

来源：

PHYSICA B-CONDENSED MATTER | 2019年 / 561卷

基金：

中国国家自然科学基金;

关键词：

Electrospinning; Ferrites; Sol-gel; Electromagnetic properties; MAGNETIC-PROPERTIES; HIGH-PERFORMANCE; THIN-FILMS; NANOFIBERS; NANOTUBES; NANOPARTICLES; FABRICATION; DEPENDENCE; COMPOSITE; POWDERS;

D O I：

10.1016/j.physb.2019.02.045

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

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.

引用

页码：16 / 22

页数：7

共 35 条

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