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<p>Polyaniline coated SrCo<sub>2</sub>Z hexaferrites (SrCo<sub>2</sub>Z@PANI composites) were successfully synthesized with mechanical blending method. The influence of PANI content on morphology, high-frequency electromagnetic properties and microwave absorption (MWA) performance is discussed in detail. It is confirmed that SrCo<sub>2</sub>Z particles are successfully coated with PANI to form SrCo<sub>2</sub>Z@PANI composites. The high dielectric PANI enhances the complex permittivity to optimize impedance matching, while the MWA performance increases with the increasing PANI content and then decreases for SrCo<sub>2</sub>Z@PANI-25%. SrCo<sub>2</sub>Z@PANI-20% exhibits the best MWA performance with the minimum reflection loss of −&#xa0;50.15&#xa0;dB at 7.84&#xa0;GHz and the effective absorption bandwidth of 4.16&#xa0;GHz with the thickness of 4.5&#xa0;mm. The excellent MWA performance is attributed to multiple loss mechanisms and good impedance matching. The main loss mechanisms in SrCo<sub>2</sub>Z@PANI composites include magnetic loss (natural resonance and exchange resonance loss), dielectric loss (interfacial polarization, dipolar polarization and conductivity loss) and multiple reflection and scattering loss.</p> Graphical abstract <p></p>

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Highly-improved high-frequency and broadband microwave absorption performance of polyaniline coated SrCo2Z hexaferrites

  • 期刊论文

  • 发表日期：

    2024年12月31日

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  • X. B. Fang,
  • B. Hong,
  • J. C. Xu,
  • Y. B. Han,
  • X. L. Peng,
  • J. Li,
  • H. W. Chen,
  • X. Q. Wang

摘要

Polyaniline coated SrCo2Z hexaferrites (SrCo2Z@PANI composites) were successfully synthesized with mechanical blending method. The influence of PANI content on morphology, high-frequency electromagnetic properties and microwave absorption (MWA) performance is discussed in detail. It is confirmed that SrCo2Z particles are successfully coated with PANI to form SrCo2Z@PANI composites. The high dielectric PANI enhances the complex permittivity to optimize impedance matching, while the MWA performance increases with the increasing PANI content and then decreases for SrCo2Z@PANI-25%. SrCo2Z@PANI-20% exhibits the best MWA performance with the minimum reflection loss of − 50.15 dB at 7.84 GHz and the effective absorption bandwidth of 4.16 GHz with the thickness of 4.5 mm. The excellent MWA performance is attributed to multiple loss mechanisms and good impedance matching. The main loss mechanisms in SrCo2Z@PANI composites include magnetic loss (natural resonance and exchange resonance loss), dielectric loss (interfacial polarization, dipolar polarization and conductivity loss) and multiple reflection and scattering loss.

Graphical abstract