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<p>To address the growing need for lightweight and multifunctional stealth materials in modern protective applications, this study presents an innovative melamine foam (MF)-based composite featuring an asymmetric dual-nano conductive network with integrated absorption-dominated electromagnetic interference (EMI) shielding, infrared (IR) stealth, and flame retardant properties. Inspired by Salisbury screen, the composites employ MF as an interlayer and flame-retardant thermoplastic polyurethane (TPU) nanofiber membrane as a substrate. The architecture features a carbon nanotubes (CNTs)-modified impedance matching nanofiber layer as the top absorber and a silver nanoparticles (AgNPs)-modified nanofiber layer as the highly conductive reflective bottom. Precise control of CNTs content and interlayer thickness enables tunable electromagnetic waves (EMWs) absorption, yielding a low reflection (0.03) and high EMI shielding effectiveness (79.23 dB) at 4.40 mm. Even at 1.40 mm, effective absorption-dominated shielding is maintained. And the performance remains stable under ultrasonic, compression, and bending, demonstrating high durability. Especially, the mechanism behind achieving absorption-dominated EMI shielding at a reduced thickness, which relies on destructive interference of EMWs enabled by the asymmetric dual-nano conductive network, is thoroughly elucidated. Additionally, the composite exhibits superior IR stealth and self-extinguishing properties. This work offers a feasible strategy for designing high-performance stealth materials with strong potential for personnel and communication equipment protection.</p>

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Multifunctional melamine foam composites featuring asymmetric conductive networks for highly absorptive EMI shielding and infrared stealth

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月26日

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  • Jinling Liu,
  • Jiayu Lu,
  • Baoqing Yang,
  • Dongyan Huang,
  • Zhangqi Han,
  • Yan Zhang,
  • Bibo Wang,
  • Dongming Qi,
  • Wei Wang

摘要

To address the growing need for lightweight and multifunctional stealth materials in modern protective applications, this study presents an innovative melamine foam (MF)-based composite featuring an asymmetric dual-nano conductive network with integrated absorption-dominated electromagnetic interference (EMI) shielding, infrared (IR) stealth, and flame retardant properties. Inspired by Salisbury screen, the composites employ MF as an interlayer and flame-retardant thermoplastic polyurethane (TPU) nanofiber membrane as a substrate. The architecture features a carbon nanotubes (CNTs)-modified impedance matching nanofiber layer as the top absorber and a silver nanoparticles (AgNPs)-modified nanofiber layer as the highly conductive reflective bottom. Precise control of CNTs content and interlayer thickness enables tunable electromagnetic waves (EMWs) absorption, yielding a low reflection (0.03) and high EMI shielding effectiveness (79.23 dB) at 4.40 mm. Even at 1.40 mm, effective absorption-dominated shielding is maintained. And the performance remains stable under ultrasonic, compression, and bending, demonstrating high durability. Especially, the mechanism behind achieving absorption-dominated EMI shielding at a reduced thickness, which relies on destructive interference of EMWs enabled by the asymmetric dual-nano conductive network, is thoroughly elucidated. Additionally, the composite exhibits superior IR stealth and self-extinguishing properties. This work offers a feasible strategy for designing high-performance stealth materials with strong potential for personnel and communication equipment protection.