J. Mater. Sci. Technol. ›› 2024, Vol. 179: 1-8.DOI: 10.1016/j.jmst.2023.09.020

• Research Article •     Next Articles

Effects of degree of graphitization of C shells on microwave absorption of Fe-C core-shell nanoparticles with excellent comparability

Daitao Kuanga,b, Yonghua Tiana, Weijie Duana, Zhikun Tiana, Xiaogang Sunc, Shiliang Wangb   

  1. aSchool of Computational Science and Electronics, Hunan Institute of Engineering, Xiangtan 411104, China;
    bSchool of Physics and Electronics, Central South University, Changsha 410083, China;
    cCollege of Mechanical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China
  • Received:2023-07-27 Revised:2023-09-05 Accepted:2023-09-05 Published:2024-04-20 Online:2024-04-15
  • Contact: *E-mail addresses: 70142@hnie.edu.cn (X. Sun), shiliang@mail.csu.edu.cn (S. Wang).

Abstract: In this study, Fe-C core-shell nanoparticles with identical metal core sizes and C shell thicknesses but varying degrees of graphitization of C shells were fabricated using metal-organic chemical vapor depo-sition and subsequent annealing. Due to the identical metal core, these nanoparticles exhibite a similar permeability, but significantly varying permittivity depending on how much C shells have been graphi-tized. It was discovered that proper graphitization of Fe-C nanoparticles annealed at 1350 °C can pro-duce excellent microwave absorption (MA), decent dielectric loss tangent in high frequency region, and moderately strong dielectric loss and attenuation properties. Furthermore, the threshold value of 1 /ωis discovered to be a crucial parameter in the theoretical analysis of nonlinear behavior of polarization loss, and thus MA performance of the nanoparticles. This research offers a useful method for creating metal-C nanoparticles with various levels of C shell graphitization. It also provides a clear answer to the crucial question of how the level of C shell graphitization affects the MA performance of metal-C nanoparticles. These results may serve as a reference for the development and mechanism analysis of highly effective metal-C based absorbers.

Key words: Fe-C, C shell, Graphitization degree, Microwave absorption