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Reduced graphene oxides: light-weight and high-efficiency electromagnetic interference shielding at elevated

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Reduced graphene oxide (r-GO) is a promising material due to its unique properties.
  • Electromagnetic interference (EMI) shielding is crucial for electronic device protection.
  • Understanding material behavior at elevated temperatures is vital for practical applications.

Purpose of the Study:

  • To investigate the high-temperature EMI shielding effectiveness of chemical graphitized r-GOs.
  • To elucidate the mechanisms behind the shielding performance, focusing on dipole polarization and hopping conductivity.
  • To analyze the influence of mass ratio on the temperature-dependent properties of r-GO composites.

Main Methods:

  • Synthesis of chemical graphitized reduced graphene oxides (r-GOs).
  • Fabrication of r-GO composites with varying mass ratios.
  • Measurement of electromagnetic properties (imaginary permittivity) and EMI shielding performance at elevated temperatures.

Main Results:

  • Chemical graphitized r-GOs demonstrate high-efficiency EMI shielding at elevated temperatures.
  • Shielding performance is attributed to the synergistic effects of dipole polarization and hopping conductivity.
  • r-GO composites exhibit distinct temperature-dependent imaginary permittivities and shielding efficiencies based on mass ratio.

Conclusions:

  • Chemical graphitized r-GOs are effective high-temperature EMI shielding materials.
  • The interplay between dipole polarization and hopping conductivity governs EMI shielding mechanisms.
  • Material composition significantly impacts the temperature-dependent electromagnetic response and shielding capabilities.