J. Mater. Sci. Technol. ›› 2024, Vol. 176: 167-175.DOI: 10.1016/j.jmst.2023.07.061

• Research article • Previous Articles     Next Articles

MXene@Co hollow spheres structure boosts interfacial polarization for broadband electromagnetic wave absorption

Yan Zhanga,1, Xuehua Liua,1, Zhiqiang Guoa, Chenyu Jiaa, Feng Lub, Zirui Jiaa,c,*, Guanglei Wua,*   

  1. aInstitute 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, China;
    bTechnical Center of Qingdao Customs, Qingdao 266002, China;
    cCollege of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, China
  • Received:2023-06-27 Revised:2023-07-11 Accepted:2023-07-11 Published:2024-03-20 Online:2024-03-15
  • Contact: *E-mail addresses: jiazirui@qdu.edu.cn (Z. Jia), wuguanglei@qdu.edu.cn, wuguanglei@mail.xjtu.edu.cn (G. Wu).
  • About author:1These authors contributed equally to this work.

Abstract: MXene is considered as a candidate for preparing high-performance electromagnetic wave absorbing materials due to its large specific surface area, rich surface modification groups, and unique metal properties. However, the impedance matching problem caused by its high conductivity and easy stacking properties is a limiting factor. In this study, a self-assembling-etching-anchoring growth method was proposed to prepare MXene@Co electromagnetic wave absorbing materials. The hollow structure of MXene microspheres constructed with PMMA as a hard template is conducive to optimizing impedance matching and surface modification. In addition, MXene@Co exhibits abundant heterogeneous interfaces, enhancing the interfacial polarization phenomenon during electromagnetic wave absorption. Meanwhile, the surface-anchored growth of magnetic Co particles forms a magnetic network, which provides a strong magnetic loss capability for the absorber. The hollow structure design significantly enhances the wave absorption performance compared to conventional MXene@Co composites, with a minimum reflection loss of -57.32 dB (effective absorption bandwidth of 5.2 GHz) when the thickness is 2.5 mm (2.2 mm). This work provides a meaningful reference for the design of MXene-based electromagnetic wave absorbing materials.

Key words: MXene@Co microspheres, Hollow structure, Impendance matching, Electromagnetic wave absorption