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<p>The development of high-performance microwave-absorbing materials with integrated thermal management capabilities is critical for advanced electronic and communication systems. In this study, we synthesized hollow core-shell structured composites through controlled pyrolysis of zeolite imidazolate framework (ZIFs). Structural and compositional characterizations confirm the successful formation of highly graphitized carbon frameworks embedded with metallic nanoparticles (Co or Zn) and a protective mesoporous SiO<sub>2</sub> shell. The as-prepared Zn–C@SiO<sub>2</sub> exhibits a minimum reflection loss (RL<sub>min</sub>) of −23.77 dB with an effective absorption bandwidth (EAB) of 6.24 GHz at 2.0 mm thickness, while Co–C@SiO<sub>2</sub> demonstrates superior microwave absorption (RL<sub>min</sub> = −51.9 dB, EAB = 5.36 GHz). The enhanced dielectric loss attributed to the interfacial polarization effects was systematically investigated. Additionally, the composites exhibit rapid thermal response, highlighting their dual functionality as microwave absorbers and thermal management materials.</p>

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Dual-functional core–shell composites: Integrated microwave absorption and thermal management properties

  • 期刊论文

  • 发表日期：

    2026年4月17日

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  • Xin Du,
  • Feifei Yan,
  • Mingtao Cheng,
  • Haoyu Li,
  • Cheng Peng,
  • Yuliang Liu,
  • Dong Liu,
  • Di Lan,
  • Guanglei Wu,
  • Zirui Jia

摘要

The development of high-performance microwave-absorbing materials with integrated thermal management capabilities is critical for advanced electronic and communication systems. In this study, we synthesized hollow core-shell structured composites through controlled pyrolysis of zeolite imidazolate framework (ZIFs). Structural and compositional characterizations confirm the successful formation of highly graphitized carbon frameworks embedded with metallic nanoparticles (Co or Zn) and a protective mesoporous SiO2 shell. The as-prepared Zn–C@SiO2 exhibits a minimum reflection loss (RLmin) of −23.77 dB with an effective absorption bandwidth (EAB) of 6.24 GHz at 2.0 mm thickness, while Co–C@SiO2 demonstrates superior microwave absorption (RLmin = −51.9 dB, EAB = 5.36 GHz). The enhanced dielectric loss attributed to the interfacial polarization effects was systematically investigated. Additionally, the composites exhibit rapid thermal response, highlighting their dual functionality as microwave absorbers and thermal management materials.