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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrical Engineering

Background:

  • Polymer matrix nanocomposites with graphene are explored for electromagnetic interference (EMI) shielding.
  • Current methods using chemical functionalization result in poor electrical conductivity due to lack of graphene interconnectedness.
  • Interconnected graphene networks offer excellent conductivity but suffer from brittleness, limiting practical applications.

Purpose of the Study:

  • To develop a superflexible, lightweight, and mechanically enhanced polymer nanocomposite for effective EMI shielding.
  • To overcome the limitations of brittleness in interconnected graphene networks.
  • To investigate the electrical and EMI shielding properties of poly(dimethylsiloxane) (PDMS) infiltrated with interconnected reduced graphene.

Main Methods:

  • Direct infiltration of flexible poly(dimethylsiloxane) (PDMS) into an interconnected reduced graphene network.
  • Characterization of mechanical properties, including tensile strength.
  • Measurement of electrical conductivity and electromagnetic interference shielding effectiveness (SE) in the X-band.

Main Results:

  • The resulting nanocomposite exhibits superflexibility, lightweight properties, enhanced mechanical strength, and improved electrical conductivity.
  • A 1.07 wt% graphene addition increased tensile strength by 64% compared to neat PDMS.
  • With 3.07 wt% graphene, electrical conductivity reached 103 S/m, achieving an EMI shielding effectiveness of approximately 54 dB (99.999% EM shielding) in the X-band.

Conclusions:

  • The developed flexible graphene-PDMS nanocomposite demonstrates excellent EMI shielding effectiveness and mechanical properties.
  • The material's superflexibility and high shielding performance make it highly promising for wearable devices and EMI shielding shelters.
  • Bluetooth communication tests confirmed the material's significant shielding capabilities.