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<p>With the advancement of science and technology, electromagnetic interference (EMI) issues caused by the high-frequency electronic devices have become increasingly prominent. The composites with high EMI shielding performance need to be urgently researched. In this study, two series of carbon nanotube/polyetherimide/ferroferric oxide (CNT/PEI/Fe₃O₄) composite films were fabricated by electrospinning, vacuum filtration, and spraying techniques, with carbon nanotube (CNT), polyetherimide (PEI), and spherical and planar ferroferric oxide (S-Fe₃O₄ and P-Fe₃O₄). Due to large specific surface area and superior interfacial adhesion, P-Fe₃O₄ particles could enhance the mechanical properties of the composite films. When the P-Fe₃O₄ content was 2 wt%, the CNT/PEI/P-Fe₃O₄ composite film achieved a tensile strength of 38.21&#xa0;MPa, which was 24.14% higher than the CNT/PEI composite film. Simultaneously, the composite film also displayed high EMI shielding effectiveness (SE) in the Ku-band (12–18&#xa0;GHz), whose maximum value was 98.44&#xa0;dB and higher than CNT/PEI (81.80&#xa0;dB). The superior performance is attributed to the synergistic shielding mechanism of absorption-reflection formed by the CNT reflection layer and the PEI/P-Fe₃O₄ absorption layer. The CNT/PEI/P-Fe₃O₄ composite displays potential application in the fields of flexible electronics and aerospace.</p>

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Lightweight and flexible CNT/PEI/Fe₃O₄ composite films with high EMI shielding performance

  • 期刊论文

  • 发表日期：

    2025年12月26日

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  • Qianshan Xia,
  • Bin Liu,
  • Tianci Wang,
  • Tianyi Liu,
  • Peng Cui,
  • Wei Song,
  • Guangping Song,
  • Yan Wang,
  • Xuan Wang

摘要

With the advancement of science and technology, electromagnetic interference (EMI) issues caused by the high-frequency electronic devices have become increasingly prominent. The composites with high EMI shielding performance need to be urgently researched. In this study, two series of carbon nanotube/polyetherimide/ferroferric oxide (CNT/PEI/Fe₃O₄) composite films were fabricated by electrospinning, vacuum filtration, and spraying techniques, with carbon nanotube (CNT), polyetherimide (PEI), and spherical and planar ferroferric oxide (S-Fe₃O₄ and P-Fe₃O₄). Due to large specific surface area and superior interfacial adhesion, P-Fe₃O₄ particles could enhance the mechanical properties of the composite films. When the P-Fe₃O₄ content was 2 wt%, the CNT/PEI/P-Fe₃O₄ composite film achieved a tensile strength of 38.21 MPa, which was 24.14% higher than the CNT/PEI composite film. Simultaneously, the composite film also displayed high EMI shielding effectiveness (SE) in the Ku-band (12–18 GHz), whose maximum value was 98.44 dB and higher than CNT/PEI (81.80 dB). The superior performance is attributed to the synergistic shielding mechanism of absorption-reflection formed by the CNT reflection layer and the PEI/P-Fe₃O₄ absorption layer. The CNT/PEI/P-Fe₃O₄ composite displays potential application in the fields of flexible electronics and aerospace.