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<p>Electromagnetic wave-absorbing materials with lightweight, low-thickness, and good heat dissipation properties are crucial in practical applications. Graphite materials are widely used in heat dissipation and electromagnetic absorption. However, excessive conductivity can worsen impedance matching. In this study, we successfully designed and fabricated weakly oxidized spherical expanded graphite (SEG) materials and corresponding SEG/Polydimethylsiloxane (PMDS) composites through structural and compositional engineering. The SEG/PDMS composites with a 6-wt% SEG mass fraction (SEG/PDMS-6) achieve 99% electromagnetic absorption in the 10–12&#xa0;GHz frequency range at a thickness of 2&#xa0;mm. Additionally, with a filler content of 8 wt% (SEG/PDMS-8), its vertical thermal conductivity reaches 0.99 W/(m·K). Therefore, the dual regulation of the physicochemical structure of graphite materials offers a novel design approach for the synergistic optimization of electromagnetic absorption and heat dissipation performance.</p>

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Weakly oxidized spherical expanded graphite/polydimethylsiloxane composites for heat dissipation and electromagnetic wave absorption

  • 期刊论文

  • 发表日期：

    2026年7月12日

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  • Dawei Liu,
  • Yuhang Liu,
  • Kang Xie,
  • Guiyong Chen,
  • Weiwei Xu,
  • Tao Yang,
  • Ning Yan,
  • Rongting Guan,
  • Feng Chen

摘要

Electromagnetic wave-absorbing materials with lightweight, low-thickness, and good heat dissipation properties are crucial in practical applications. Graphite materials are widely used in heat dissipation and electromagnetic absorption. However, excessive conductivity can worsen impedance matching. In this study, we successfully designed and fabricated weakly oxidized spherical expanded graphite (SEG) materials and corresponding SEG/Polydimethylsiloxane (PMDS) composites through structural and compositional engineering. The SEG/PDMS composites with a 6-wt% SEG mass fraction (SEG/PDMS-6) achieve 99% electromagnetic absorption in the 10–12 GHz frequency range at a thickness of 2 mm. Additionally, with a filler content of 8 wt% (SEG/PDMS-8), its vertical thermal conductivity reaches 0.99 W/(m·K). Therefore, the dual regulation of the physicochemical structure of graphite materials offers a novel design approach for the synergistic optimization of electromagnetic absorption and heat dissipation performance.