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Multifunctional Cellulose/rGO/Fe3O4 Composite Aerogels for Electromagnetic Interference Shielding.

Yian Chen1,2, Petra Pötschke1, Jürgen Pionteck1

  • 1Leibniz-Institut für Polymerforschung Dresden e.V. (Leibniz Institute of Polymer Research Dresden), Hohe Straße 6, 01069 Dresden, Germany.

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Summary

Lightweight cellulose/reduced graphene oxide (rGO)/Fe3O4 aerogels offer strong electromagnetic interference shielding. These materials demonstrate high effectiveness due to absorption and multireflection, making them suitable for advanced applications.

Keywords:
EMI shieldingaerogelcelluloseiron oxidereduced graphene oxide (rGO)

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electromagnetics

Background:

  • Electromagnetic interference (EMI) poses challenges in electronic devices.
  • Effective EMI shielding materials are crucial for device performance and reliability.
  • Developing lightweight, high-performance EMI shielding solutions remains an active research area.

Purpose of the Study:

  • To develop and characterize novel cellulose/reduced graphene oxide (rGO)/Fe3O4 aerogels for EMI shielding.
  • To investigate the relationship between material composition, thickness, and EMI shielding effectiveness.
  • To elucidate the EMI shielding mechanism in these composite aerogels.

Main Methods:

  • Green, simple, and scalable coprecipitation synthesis of cellulose/rGO/Fe3O4 aerogels.
  • Systematic variation of rGO loading (3-8 wt%) and aerogel thickness (0.5-2 mm).
  • Electromagnetic wave absorption and EMI shielding effectiveness (SE) measurements in the 8.2-12.4 GHz range.

Main Results:

  • Cellulose/rGO/Fe3O4 aerogels exhibited strong electromagnetic wave absorption.
  • An 8 wt% rGO and ~15 wt% Fe3O4 aerogel (0.5 mm thick) achieved EMI SE of 32.4-40.1 dB.
  • Increasing rGO loading and thickness significantly enhanced EMI shielding, reaching 49.4-52.4 dB at 2.0 mm thickness.

Conclusions:

  • The synthesized cellulose/rGO/Fe3O4 aerogels are highly effective EMI shielding materials.
  • Absorption is the primary mechanism, enhanced by multireflection and impedance matching.
  • These lightweight aerogels show great potential for practical EMI shielding applications.