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Multifunctional MXene/Aramid Nanofiber Composite Films for Efficient Electromagnetic Interference Shielding and

Tianshu Peng1, Shanchi Wang1, Zhiguang Xu2

  • 1College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China.

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|August 29, 2022
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New flexible films made from MXene and aramid nanofibers (ANF) offer high electromagnetic interference (EMI) shielding and fire detection. These materials enhance device safety by providing early fire alerts and robust shielding.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electromagnetics

Background:

  • Highly integrated electronic devices require advanced materials for electromagnetic interference (EMI) shielding.
  • Potential fire hazards from device operation necessitate materials with flame retardancy and fire detection capabilities.

Purpose of the Study:

  • To fabricate multifunctional flexible films with dual functions of high EMI shielding and repeatable fire detection.
  • To investigate the synergistic effects of MXene and aramid nanofibers (ANF) in composite films.

Main Methods:

  • Fabrication of composite films using vacuum filtration of MXene and ANF suspensions.
  • Characterization of mechanical, EMI shielding, and fire detection properties.
  • Analysis of hydrogen bonding between MXene and ANFs for structural reinforcement.

Main Results:

  • Composite films with 20 wt % ANF showed a tensile strength increase from 24.6 MPa to 79.5 MPa.
  • A 9 μm thick film achieved an EMI shielding effectiveness (SE) of ~40 dB and a specific SE (SSE) of 4361.1 dB/mm.
  • Films triggered fire detection systems within 10 s due to MXene's thermoelectric property and maintained structural integrity.

Conclusions:

  • The developed MXene/ANF composite films offer excellent EMI shielding and reliable fire detection.
  • The synergistic combination of MXene and ANFs provides enhanced mechanical strength and multifunctional properties.
  • These films are promising for enhancing the safety of electronic and telecommunication devices.