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<p>The development of high-performance microwave absorbers requires a deep understanding of the synergistic effects between cation doping in ferrites and carbon nanotubes (CNTs). To this end, a series of trivalent metal ions (Al<sup>3+</sup>, Cr<sup>3+</sup>, Fe<sup>3+</sup>, Ga<sup>3+</sup>, In<sup>3+</sup>)-doped Ni<sub>0.6</sub>Zn<sub>0.4</sub>M<sub>0.2</sub>Fe<sub>1.75</sub>O<sub>4</sub> ferrites and their composites with 7 wt% CNTs were systematically synthesized. Among the pure ferrites, the Ga<sup>3+</sup>-doped sample showed the best performance (RL<sub>min</sub> = − 31.58&#xa0;dB at 4.3&#xa0;mm). Critically, the introduction of CNTs substantially enhanced the absorption performance, as evidenced by a broadened effective bandwidth and reduced reflection loss, which ultimately led to a distinct shift in the optimal system. The In<sup>3+</sup>-doped ferrite/CNT composite emerged as the superior absorber, achieving an RL<sub>min</sub> of − 46.83&#xa0;dB at a thinner thickness of 2.98&#xa0;mm, markedly outperforming all other composites and the premier single-phase ferrite. This work reveals the distinct roles of various dopants in tuning intrinsic electromagnetic properties and demonstrates that the enhancement via CNTs stems from a balanced dielectric/magnetic loss and optimized impedance matching. The most effective synergy was uniquely realized in the In<sup>3+</sup>-doped system, highlighting its significant potential as a high-performance microwave-absorbing material.</p>

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Broadband and strong microwave absorption achieved by trivalent ion-doped ferrite composites with carbon nanotubes

  • 期刊论文

  • 发表日期：

    2025年12月13日

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  • Zhihao Geng,
  • Yujie Yang,
  • Hao Li,
  • Zhenyu Zhang,
  • Hongyu Ding

摘要

The development of high-performance microwave absorbers requires a deep understanding of the synergistic effects between cation doping in ferrites and carbon nanotubes (CNTs). To this end, a series of trivalent metal ions (Al3+, Cr3+, Fe3+, Ga3+, In3+)-doped Ni0.6Zn0.4M0.2Fe1.75O4 ferrites and their composites with 7 wt% CNTs were systematically synthesized. Among the pure ferrites, the Ga3+-doped sample showed the best performance (RLmin = − 31.58 dB at 4.3 mm). Critically, the introduction of CNTs substantially enhanced the absorption performance, as evidenced by a broadened effective bandwidth and reduced reflection loss, which ultimately led to a distinct shift in the optimal system. The In3+-doped ferrite/CNT composite emerged as the superior absorber, achieving an RLmin of − 46.83 dB at a thinner thickness of 2.98 mm, markedly outperforming all other composites and the premier single-phase ferrite. This work reveals the distinct roles of various dopants in tuning intrinsic electromagnetic properties and demonstrates that the enhancement via CNTs stems from a balanced dielectric/magnetic loss and optimized impedance matching. The most effective synergy was uniquely realized in the In3+-doped system, highlighting its significant potential as a high-performance microwave-absorbing material.