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<p>Current electromagnetic interference (EMI) shielding materials mainly depends on electrical conductivity, it still remains great challenges to avoid short-circuit risks and assemble into macroscopic films with strong mechanical strength. To address these problems, we rationally design and prepare a multilayer-structured EMI shielding nanocomposite film (P-Co-MX), where MOF-derived porous Co–C as the magnetic layer and MXene as the conductive layer are sandwiched between two poly(m-phenylene isophthalamide) (PMIA) nanofiber membranes, with the PMIA membranes as insulating and protection layers. Benefiting from the rational design of multi-layer structure, P-Co-MX exhibits high EMI shielding effectiveness in X-band (8.2–12.4 GHz) with absorption-dominated EMI shielding feature. Owing to the protection of PMIA nanofiber layers, P-Co-MX shows high resistivity, excellent flexibility and stable EMI shielding performance even in harsh conditions, including 200 ℃ high temperature, − 196 ℃ ultralow-temperature and corrosive conditions (pH = 3). These unique features allow for direct wrapping on the signal lines in highly miniaturized and flexible electronics to solve EMI issue.</p> Graphical Abstract <p></p>

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Insulating and flexible electromagnetic-shielding nanofiber composite film for direct wrapping on electronics even in harsh conditions

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年3月14日

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  • Xueting Zhang,
  • Guoqiang Jin,
  • Yan Liu,
  • Yake Liu,
  • Mingyan Zhang,
  • Congju Li,
  • Xiuling Zhang,
  • Dapeng Cao

摘要

Current electromagnetic interference (EMI) shielding materials mainly depends on electrical conductivity, it still remains great challenges to avoid short-circuit risks and assemble into macroscopic films with strong mechanical strength. To address these problems, we rationally design and prepare a multilayer-structured EMI shielding nanocomposite film (P-Co-MX), where MOF-derived porous Co–C as the magnetic layer and MXene as the conductive layer are sandwiched between two poly(m-phenylene isophthalamide) (PMIA) nanofiber membranes, with the PMIA membranes as insulating and protection layers. Benefiting from the rational design of multi-layer structure, P-Co-MX exhibits high EMI shielding effectiveness in X-band (8.2–12.4 GHz) with absorption-dominated EMI shielding feature. Owing to the protection of PMIA nanofiber layers, P-Co-MX shows high resistivity, excellent flexibility and stable EMI shielding performance even in harsh conditions, including 200 ℃ high temperature, − 196 ℃ ultralow-temperature and corrosive conditions (pH = 3). These unique features allow for direct wrapping on the signal lines in highly miniaturized and flexible electronics to solve EMI issue.

Graphical Abstract