In-situ growth of core-shell ZnFe2O4 @ porous hollow carbon microspheres as an efficient microwave absorber

Liang Chai; Yiqun Wang; Nifan Zhou; Yu Du; Xiaodong Zeng; Shiyi Zhou; Qinchuan He; Guanglei Wu

doi:10.1016/j.jcis.2020.07.102

In-situ growth of core-shell ZnFe₂O₄ @ porous hollow carbon microspheres as an efficient microwave absorber

J Colloid Interface Sci. 2021 Jan 1;581(Pt B):475-484. doi: 10.1016/j.jcis.2020.07.102. Epub 2020 Jul 25.

Authors

Liang Chai¹, Yiqun Wang², Nifan Zhou¹, Yu Du¹, Xiaodong Zeng¹, Shiyi Zhou¹, Qinchuan He¹, Guanglei Wu³

Affiliations

¹ College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, PR China.
² College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, PR China. Electronic address: wangyiqun17@cdut.edu.cn.
³ 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@mail.xjtu.edu.cn.

PMID: 32805668
DOI: 10.1016/j.jcis.2020.07.102

Abstract

The special structure and composition are the important factors that determine the microwave absorption properties. In this study, the porous hollow carbon microsphere (PHCMS) is synthesized by the self-assembly technology, and ZnFe₂O₄ particles are synthesized inside the carbon sphere by in-situ preparation with taking advantage of the porous and hollow characteristics of the carbon sphere, which prepares ZnFe₂O₄@PHCMS composite material. The composite shows good performance in terms of minimum reflection loss and absorption bandwidth. The results show that the maximum adsorption capacity of the composite is -51.43 dB at 7.2 GHz. When the thickness is 4.8 mm, the effective absorption bandwidth of RL ≤ 10 dB electromagnetic wave is 3.52 GHz. Such enhanced electromagnetic wave absorption properties of ZnFe₂O₄@PHCMS are ascribed to the suitable impedance characteristic, the dipole polarization and interfacial polarization, the multiple Debye relaxation process and strong natural resonance, multiple reflection and scattering. This work provides an approach to design effective microwave absorbers having a unique structure to enhance the microwave absorption properties.

Keywords: Electromagnetic wave absorption; Hybrids composites; Porous hollow carbon; ZnFe(2)O(4).