Investigation and optimization of Fe/ZnFe2O4 as a Wide-band electromagnetic absorber

Guanglei Wu; Hongxia Zhang; Xixi Luo; Lieji Yang; Hualiang Lv

doi:10.1016/j.jcis.2018.10.084

Investigation and optimization of Fe/ZnFe₂O₄ as a Wide-band electromagnetic absorber

J Colloid Interface Sci. 2019 Feb 15:536:548-555. doi: 10.1016/j.jcis.2018.10.084. Epub 2018 Oct 26.

Authors

Guanglei Wu¹, Hongxia Zhang², Xixi Luo³, Lieji Yang⁴, Hualiang Lv⁵

Affiliations

¹ Institute of Materials for Energy and Environment, State Key Laboratory Breeding Based of New Fiber Materials and Modern Textile, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, PR China. Electronic address: wuguanglei@qdu.edu.cn.
² Institute of Materials for Energy and Environment, State Key Laboratory Breeding Based of New Fiber Materials and Modern Textile, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, PR China.
³ School of Materials Engineering, Xi'an Aeronautical University, Xi'an 710077, PR China.
⁴ College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China.
⁵ College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China. Electronic address: yexuexun5309@gmail.com.

PMID: 30388532
DOI: 10.1016/j.jcis.2018.10.084

Abstract

In this research, a facile in-situ growth method was applied to load ZnFe₂O₄ nanoparticles on carbonyl iron (Fe) flakes. These loaded ZnFe₂O₄ exhibited cone shape with an average size of ∼200 nm. The results revealed that the frequency region with reflection loss <-10 dB (f_E) was up to 6.2 GHz (d = 1.5 mm), suggesting excellent wideband electromagnetic absorption (EM) properties. The electromagnetic absorption mechanism was discussed in depth which attributed to the synergetic effect of Fe and ZnFe₂O₄. The loaded ZnFe₂O₄ played a key role on suppressing inverse electromagnetic radiation, eddy effect, simultaneous maintaining moderate magnetic loss ability. Besides, the formed interface of ZnFe₂O₄/Fe could induce interface polarization relaxation effect at external electromagnetic field, which greatly boosted the effective dielectric loss ability (ε''_E). Meanwhile, the interface polarization intensity was controllable by tuning the weight ratio of Fe.

Keywords: Efficient dielectric/magnetic loss; In-situ growth; Interface strategy; Wide-band; ZnFe(2)O(4) cone.