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<p>The escalating demand for 5G/6G communication technologies requires&#xa0;ultra-lightweight&#xa0;and high-performance electromagnetic interference (EMI) shielding materials. However, biomass-derived carbon materials often suffer from intrinsically low conductivity and poor interfacial adhesion with metallic coatings. In this work, we present a&#xa0;mussel-inspired interfacial engineering strategy&#xa0;to fabricate a high-performance silver-coated wood-derived carbon composite. By utilizing polydopamine (PDA) as a universal adhesive, a continuous silver conductive network was constructed via in-situ electroless plating, transforming the interface from weak physical adsorption to&#xa0;robust chemical coupling.This structural design synergistically combines conductive loss from the Ag network with dielectric loss and multiple scattering within the hierarchical porous carbon matrix. Consequently, the optimized composite (LCW/Ag) achieves an exceptional EMI shielding effectiveness (SE) of 66.43&#xa0;dB in the x-band and 104.91&#xa0;dB in the Ka-band, despite possessing an ultralow density of merely 0.327&#xa0;g·cm⁻<sup>3</sup>. The specific electromagnetic shielding efficiency (SSE/t) of LCW/Ag<sub>800-60</sub> in the Ka-band is 2333&#xa0;dB·cm<sup>2</sup>·g⁻<sup>1</sup>.&#xa0;This remarkable performance, combined with the material’s low density, results in a superior specific shielding effectiveness.Furthermore, the silver coating significantly enhances the thermal stability and corrosion resistance of the carbon scaffold. This work presents a facile, eco-friendly route to fabricate&#xa0;advanced biomass-derived ceramic/carbon composites, demonstrating great potential for applications in next-generation aerospace and high-frequency electronic devices.</p>

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Mussel-inspired interfacial engineering for ultralight wood-derived carbon/silver composites with superior broadband emi shielding performance

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Wenjin Hu,
  • Yong Zhang,
  • Xia Shu,
  • Xueru Zhang,
  • Jiewu Cui,
  • Yan Wang,
  • Jiaqin Liu,
  • Yucheng Wu

摘要

The escalating demand for 5G/6G communication technologies requires ultra-lightweight and high-performance electromagnetic interference (EMI) shielding materials. However, biomass-derived carbon materials often suffer from intrinsically low conductivity and poor interfacial adhesion with metallic coatings. In this work, we present a mussel-inspired interfacial engineering strategy to fabricate a high-performance silver-coated wood-derived carbon composite. By utilizing polydopamine (PDA) as a universal adhesive, a continuous silver conductive network was constructed via in-situ electroless plating, transforming the interface from weak physical adsorption to robust chemical coupling.This structural design synergistically combines conductive loss from the Ag network with dielectric loss and multiple scattering within the hierarchical porous carbon matrix. Consequently, the optimized composite (LCW/Ag) achieves an exceptional EMI shielding effectiveness (SE) of 66.43 dB in the x-band and 104.91 dB in the Ka-band, despite possessing an ultralow density of merely 0.327 g·cm⁻3. The specific electromagnetic shielding efficiency (SSE/t) of LCW/Ag800-60 in the Ka-band is 2333 dB·cm2·g⁻1. This remarkable performance, combined with the material’s low density, results in a superior specific shielding effectiveness.Furthermore, the silver coating significantly enhances the thermal stability and corrosion resistance of the carbon scaffold. This work presents a facile, eco-friendly route to fabricate advanced biomass-derived ceramic/carbon composites, demonstrating great potential for applications in next-generation aerospace and high-frequency electronic devices.