4.7 Article

Ultrathin CoNi@Ti3C2TX composites with sandwich structures for efficient microwave absorption

期刊

CERAMICS INTERNATIONAL
卷 48, 期 22, 页码 33751-33762

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.07.320

关键词

Electromagnetic wave absorption; Magnetic nanoparticles; Interfacial polarization; Synergistic effect

资金

  1. National Natural Science Foundation of China [U2004177, U21A2064]
  2. Outstanding Youth Fund of Henan Province [212300410081]
  3. Support plan for scientific and technological innovation talents in colleges and universities of Henan Province [22HASTIT001]

向作者/读者索取更多资源

CoNi@Ti3C2TX composites with CoNi alloy particles decorated on the surface and interlayer of Ti3C2TX were successfully synthesized by a simple solvent thermal reduction method. The introduction of CoNi particles significantly enhanced the soft magnetic properties of the composites. By adjusting the electromagnetic parameters, the optimal electromagnetic absorption performance was achieved.
To obtain high-performance electromagnetic absorbing materials, we designed CoNi@Ti3C2TX composites by a simple solvent thermal reduction method. Herein, we report the successful decoration of 80 nm CoNi alloy particles on the surface and interlayer of Ti3C2TX. The calculated results show that the introduction of CoNi particles into the composites leads to dielectric loss and increases in Ms and Hc, significantly enhancing the soft magnetic properties of the CoNi@Ti3C2TX composites. After adjusting the electromagnetic parameters, the optimal RL value of-51.5 dB is obtained at the frequency of 13.9 GHz, and the corresponding thickness is only 1.1 mm. The expected impedance matching and electromagnetic attenuation properties of the CoNi@Ti3C2TX composites are attributed to synergic dual loss mechanisms - dielectric loss and magnetic loss - between the CoNi alloy particles and Ti3C2TX. These are mainly due to conduction loss, dipole polarization, and interface polari-zation, as well as natural resonance and eddy current losses generated by CoNi nanoparticles. The lightweight and highly reflective CoNi@Ti3C2TX composites are promising for applications as highly effective electromag-netic absorbers.

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