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<p>Herein, a novel Janus-structured multifunctional membrane with integrated electromagnetic interference (EMI) shielding and personalized thermal management is fabricated using shear-induced in situ fibrillation and vacuum-assisted filtration. Interestingly, within the polytetrafluoroethylene (PTFE)-carbon nanotube (CNT)-Fe<sub>3</sub>O<sub>4</sub> layer (FCFe), CNT nanofibers interweave with PTFE fibers to form a stable “silk-like” structure that effectively captures Fe<sub>3</sub>O<sub>4</sub> particles. By incorporating a highly conductive MXene layer, the FCFe/MXene (FCFe/M) membrane exhibits excellent electrical/thermal conductivity, mechanical properties, and flame retardancy. Impressively, benefiting from the rational regulation of component proportions and the design of a Janus structure, the FCFe/M membrane with a thickness of only 84.9&#xa0;µm delivers outstanding EMI shielding effectiveness of 44.56&#xa0;dB in the X-band, with a normalized specific SE reaching 10,421.3&#xa0;dB cm<sup>2</sup>&#xa0;g<sup>−1</sup>, which is attributed to the “absorption-reflection-reabsorption” mechanism. Furthermore, the membrane demonstrates low-voltage-driven Joule heating and fast-response photothermal performance. Under the stimulation of a 3&#xa0;V voltage and an optical power density of 320&#xa0;mW cm<sup>−2</sup>, the surface temperatures of the FCFe/M membranes can reach up to 140.4 and 145.7&#xa0;°C, respectively. In brief, the FCFe/M membrane with anti-electromagnetic radiation and temperature regulation is an attractive candidate for the next generation of wearable electronics, EMI compatibility, visual heating, thermotherapy, and military and aerospace applications. </p>

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Multifunctional Janus-Structured Polytetrafluoroethylene-Carbon Nanotube-Fe3O4/MXene Membranes for Enhanced EMI Shielding and Thermal Management

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月6日

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  • Runze Shao,
  • Guilong Wang,
  • Jialong Chai,
  • Jun Lin,
  • Guoqun Zhao,
  • Zhihui Zeng,
  • Guizhen Wang

摘要

Herein, a novel Janus-structured multifunctional membrane with integrated electromagnetic interference (EMI) shielding and personalized thermal management is fabricated using shear-induced in situ fibrillation and vacuum-assisted filtration. Interestingly, within the polytetrafluoroethylene (PTFE)-carbon nanotube (CNT)-Fe3O4 layer (FCFe), CNT nanofibers interweave with PTFE fibers to form a stable “silk-like” structure that effectively captures Fe3O4 particles. By incorporating a highly conductive MXene layer, the FCFe/MXene (FCFe/M) membrane exhibits excellent electrical/thermal conductivity, mechanical properties, and flame retardancy. Impressively, benefiting from the rational regulation of component proportions and the design of a Janus structure, the FCFe/M membrane with a thickness of only 84.9 µm delivers outstanding EMI shielding effectiveness of 44.56 dB in the X-band, with a normalized specific SE reaching 10,421.3 dB cm2 g−1, which is attributed to the “absorption-reflection-reabsorption” mechanism. Furthermore, the membrane demonstrates low-voltage-driven Joule heating and fast-response photothermal performance. Under the stimulation of a 3 V voltage and an optical power density of 320 mW cm−2, the surface temperatures of the FCFe/M membranes can reach up to 140.4 and 145.7 °C, respectively. In brief, the FCFe/M membrane with anti-electromagnetic radiation and temperature regulation is an attractive candidate for the next generation of wearable electronics, EMI compatibility, visual heating, thermotherapy, and military and aerospace applications.