Interconnected magnetic carbon@NixCo1-xFe2O4 nanospheres with core-shell structure: An efficient and thin electromagnetic wave absorber

Xingliang Chen; Yan Wang; Hailing Liu; Shu Jin; Guanglei Wu

doi:10.1016/j.jcis.2021.07.094

Interconnected magnetic carbon@Ni_xCo_1-xFe₂O₄ nanospheres with core-shell structure: An efficient and thin electromagnetic wave absorber

J Colloid Interface Sci. 2022 Jan 15;606(Pt 1):526-536. doi: 10.1016/j.jcis.2021.07.094. Epub 2021 Aug 11.

Authors

Xingliang Chen¹, Yan Wang², Hailing Liu³, Shu Jin³, Guanglei Wu⁴

Affiliations

¹ Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province, Shaoxing University, Shaoxing 312000, PR China. Electronic address: chenxlmoon@163.com.
² School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an, 710021, PR China.
³ Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province, Shaoxing University, Shaoxing 312000, PR China.
⁴ Institute of Materials for Energy and Environment, State Key Laboratory of Bio-fibers and Eco-textiles, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, PR China. Electronic address: wuguanglei@qdu.edu.cn.

PMID: 34411827
DOI: 10.1016/j.jcis.2021.07.094

Abstract

The applications of cobalt ferrite and nickel ferrite composite materials on electromagnetic (EM) wave absorption are the research hotspot currently. However, the systematical comparison study between these two ferrites composites have rarely been carried out. Thus, the EM wave absorption performance of interconnected carbon@Ni_xCo_1-xFe₂O₄ composites with core-shell structures were investigated comprehensively in this work. A series of magnetic nanospheres including NiFe₂O₄, cobalt-doped nickel ferrite, nickel-cobalt ferrite, nickel-doped cobalt ferrite and CoFe₂O₄ were synthesized firstly, and then uniformly encapsulation by carbon rendered the corresponding C@Ni_xCo_1-xFe₂O₄ composites nanospheres. Synthesis reactions involved for C@Ni_xCo_1-xFe₂O₄ formation were investigated in detail, and afterwards their magnetic behavior, EM wave absorption performance and absorbing mechanism were thoroughly explored and analyzed. Results show that when nickel is dominant element and cobalt is doping element (Ni_0.75Co_0.25Fe₂O₄), the composite nanosphere exhibits optimum EM wave absorption performance. When the sample thickness is just 1.9 mm, its RL_min value can reach -51 dB, and the corresponding EAB width is 3.3 GHz. The synthesized C@Ni_0.75Co_0.25Fe₂O₄ can be qualified as an efficient and thin electromagnetic wave absorber, which is mainly attributed to its special structure, fair electromagnetic matching and impedance matching.

Keywords: Core-shell nanosphere; EM wave absorption performance; Ferrite; Interconnected structure; Magnetic behavior.