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<p>Polymer-based wave-absorbing materials have garnered significant attention in recent years due to their lightweight nature, high efficiency, excellent processability, and broad adaptability. However, achieving a balance between high electromagnetic interference (EMI) shielding effectiveness, wide-band absorption and low electromagnetic wave reflection remains a critical challenge. To address this, this research developed a non-uniform multilayer composite EMI shielding material with low reflection, high EMI absorption, and robust mechanical properties using a simple and effective approach. By precisely controlling the ratio and concentration of magnetic particles and silica aerogel in the electromagnetic wave incident layer, utilizing the high porosity of Felt and its multilayer fiber structure to achieve superior matching impedance (The average value of the best matching impedance is 1.1.), and optimizing the concentration of carbon nanotubes to create an intermediate dielectric loss and conductive network layer. Additionally, a graphene-silver nanowire hybridized conductive thin-film reflective layer was integrated, we successfully designed a composite material. The resulting multilayer composite wave-absorbing material allows for tunable absorption and reflection capabilities by adjusting the filler concentrations and ratios in each layer. So we realized the EMI SE of multilayer composite wave-absorbing materials up to 62.2 at 8–12 GHz (X-band) with a minimum reflectivity of 0.08 by rational layout of materials, the maximum tensile strength is 14.21MPa. This study provides a simple yet reliable approach to constructing high-performance multilayer composite materials with superior wave-absorbing properties.</p>

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Preparation and high absorption electromagnetic shielding performance of fiber-reinforced multilayer structure composites with iron-nickel oxide and silica aerogel

  • 期刊论文

  • 发表日期：

    2025年7月9日

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  • Song Wu,
  • Na Tian,
  • Qingqing Shen,
  • Junmin Wan

摘要

Polymer-based wave-absorbing materials have garnered significant attention in recent years due to their lightweight nature, high efficiency, excellent processability, and broad adaptability. However, achieving a balance between high electromagnetic interference (EMI) shielding effectiveness, wide-band absorption and low electromagnetic wave reflection remains a critical challenge. To address this, this research developed a non-uniform multilayer composite EMI shielding material with low reflection, high EMI absorption, and robust mechanical properties using a simple and effective approach. By precisely controlling the ratio and concentration of magnetic particles and silica aerogel in the electromagnetic wave incident layer, utilizing the high porosity of Felt and its multilayer fiber structure to achieve superior matching impedance (The average value of the best matching impedance is 1.1.), and optimizing the concentration of carbon nanotubes to create an intermediate dielectric loss and conductive network layer. Additionally, a graphene-silver nanowire hybridized conductive thin-film reflective layer was integrated, we successfully designed a composite material. The resulting multilayer composite wave-absorbing material allows for tunable absorption and reflection capabilities by adjusting the filler concentrations and ratios in each layer. So we realized the EMI SE of multilayer composite wave-absorbing materials up to 62.2 at 8–12 GHz (X-band) with a minimum reflectivity of 0.08 by rational layout of materials, the maximum tensile strength is 14.21MPa. This study provides a simple yet reliable approach to constructing high-performance multilayer composite materials with superior wave-absorbing properties.