Core-shell CoFe2O4@C nanoparticles coupled with rGO for strong wideband microwave absorption

Xiaoxiao Zhao; Ying Huang; Xudong Liu; Jing Yan; Ling Ding; Meng Zong; Panbo Liu; Tiehu Li

doi:10.1016/j.jcis.2021.08.203

Core-shell CoFe₂O₄@C nanoparticles coupled with rGO for strong wideband microwave absorption

J Colloid Interface Sci. 2022 Feb;607(Pt 1):192-202. doi: 10.1016/j.jcis.2021.08.203. Epub 2021 Sep 1.

Authors

Xiaoxiao Zhao¹, Ying Huang², Xudong Liu¹, Jing Yan¹, Ling Ding¹, Meng Zong³, Panbo Liu¹, Tiehu Li⁴

Affiliations

¹ The MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, Ministry of Education, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710129, PR China.
² The MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, Ministry of Education, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710129, PR China. Electronic address: yingh@nwpu.edu.cn.
³ The MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, Ministry of Education, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710129, PR China. Electronic address: zongmeng@nwpu.edu.cn.
⁴ NPU-NCP Joint International Research Center on Advanced Nanomaterials & Defects Engineering, State Key Laboratory of Solidification Processing, Shaanxi Engineering Laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, PR China.

PMID: 34500418
DOI: 10.1016/j.jcis.2021.08.203

Abstract

Strong absorption and large bandwidth are two contributors to materials' absorbing performance. In this work, a series of multi-element core-shell magnetic nano-particle composite layered graphene absorbing materials CoFe₂O₄@C/rGO (CCr) were prepared by adjusting carbon shell thickness. The CCr at a low thickness achieved strong microwave absorption and a wide effective absorption bandwidth. Not only the core-shell structure of the magnetic nanoparticle CoFe₂O₄@C (CFO@C) increases the interface loss, but both the coating carbon shell and the core CoFe₂O₄ (CFO) are beneficial to improve impedance matching. Due to the synergistic effect of the dielectric and magnetic properties of graphene and ferrite, CCr possessed high absorption performance, and its minimum reflection loss reached (R_Lmin) -52.5 dB when the thickness was only 2 mm. At the same time, the effective absorption bandwidth (EAB) was 5.68 GHz when the thickness was only 1.7 mm. The chemically stable core-shell dielectric nanocomposite provided a new solution for preparing materials with excellent chemical structure and high absorbing properties.

Keywords: CoFe(2)O(4); Core-shell; Microwave absorption; rGO.