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<p>Fe<sub>3</sub>O<sub>4</sub>, possessing both dielectric and magnetic loss mechanisms, is an excellent microwave absorbing material. Nevertheless, the challenges posed by the poor impedance matching and narrow absorption bandwidth of pure Fe<sub>3</sub>O<sub>4</sub> are significant. In this study, ordered mesoporous silica (SBA-15) was employed as a hard template, and Fe<sub>3</sub>O<sub>4</sub>/SBA-15 composites were synthesized through nano-impregnation. The results show that the impedance matching of the composites is effectively improved by increasing the content of SBA-15. In addition, the porous structure of SBA-15 extends the propagation distance of electromagnetic waves inside the material, thereby improving the microwave absorption performance of the composite material. Notably, when the molar ratio of Fe<sub>3</sub>O<sub>4</sub> to SBA-15 is 10:13, the composite exhibits optimal microwave absorption properties, with a maximum reflection loss of −&#xa0;35.21&#xa0;dB and an effective absorption bandwidth of 5.44&#xa0;GHz. Further analysis reveals that the microwave absorption performance of this composite primarily stems from the synergistic effect of dielectric and magnetic losses, including interfacial polarization, dipole polarization, and various ferromagnetic resonance loss mechanisms. This study provides new insights into the development of high-performance microwave absorbing materials.</p>

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Optimization of electromagnetic wave absorption properties of Fe3O4/SBA-15

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Tao Shen,
  • Xiaoling Peng,
  • Jing Li,
  • Shan Tao,
  • Jingcai Xu,
  • Bo Hong,
  • Xinqing Wang

摘要

Fe3O4, possessing both dielectric and magnetic loss mechanisms, is an excellent microwave absorbing material. Nevertheless, the challenges posed by the poor impedance matching and narrow absorption bandwidth of pure Fe3O4 are significant. In this study, ordered mesoporous silica (SBA-15) was employed as a hard template, and Fe3O4/SBA-15 composites were synthesized through nano-impregnation. The results show that the impedance matching of the composites is effectively improved by increasing the content of SBA-15. In addition, the porous structure of SBA-15 extends the propagation distance of electromagnetic waves inside the material, thereby improving the microwave absorption performance of the composite material. Notably, when the molar ratio of Fe3O4 to SBA-15 is 10:13, the composite exhibits optimal microwave absorption properties, with a maximum reflection loss of − 35.21 dB and an effective absorption bandwidth of 5.44 GHz. Further analysis reveals that the microwave absorption performance of this composite primarily stems from the synergistic effect of dielectric and magnetic losses, including interfacial polarization, dipole polarization, and various ferromagnetic resonance loss mechanisms. This study provides new insights into the development of high-performance microwave absorbing materials.