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Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets
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Ultralight Graphene Foam/Conductive Polymer Composites for Exceptional Electromagnetic Interference Shielding.

Ying Wu1, Zhenyu Wang1, Xu Liu1

  • 1Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong.

ACS Applied Materials & Interfaces
|February 23, 2017
PubMed
Summary

Ultralight graphene foam (GF)/PEDOT:PSS composites offer superior electromagnetic interference (EMI) shielding. These advanced materials achieve record-breaking shielding effectiveness for next-generation electronic applications.

Keywords:
EMI shieldinggraphene foam compositesnegative permittivitynoncovalent functionalizationultralightweight

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Science

Background:

  • Electromagnetic interference (EMI) shielding is crucial for protecting electronic devices.
  • Developing lightweight, high-performance shielding materials remains a significant challenge.
  • Graphene foam (GF) and conductive polymers like PEDOT:PSS show promise for EMI shielding applications.

Purpose of the Study:

  • To develop ultralight, high-performance EMI shielding composites using graphene foam and PEDOT:PSS.
  • To enhance the properties of GF/PEDOT:PSS composites through surface functionalization.
  • To investigate the relationship between material properties and EMI shielding performance.

Main Methods:

  • Fabrication of GF/PEDOT:PSS composites via drop coating PEDOT:PSS onto functionalized GF.
  • Surface functionalization of GF using 4-dodecylbenzenesulfonic acid to improve wettability and interfacial bonding.
  • Characterization of composite density, porosity, electrical conductivity, and EMI shielding effectiveness (SE).

Main Results:

  • Achieved ultralow density (18.2 × 10-3 g/cm3) and high porosity (98.8%) composites.
  • Enhanced electrical conductivity from 11.8 to 43.2 S/cm, a nearly fourfold increase.
  • Demonstrated remarkable EMI shielding effectiveness (SE) of 91.9 dB and specific SE (SSE) of 3124 dB·cm3/g, surpassing existing carbon-based polymer composites.
  • Attributed performance to excellent conductivity, porous structure, charge delocalization, and left-handed composite properties.

Conclusions:

  • The developed GF/PEDOT:PSS composites represent a breakthrough in ultralight, high-performance EMI shielding materials.
  • The synergistic effects of graphene foam's conductive network and PEDOT:PSS coating are key to the superior shielding performance.
  • These findings pave the way for advanced EMI shielding solutions in various electronic and communication systems.