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Related Experiment Video

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Stretchable PEDOT:PSS/Li-TFSI/XSB Composite Films for Electromagnetic Interference Shielding.

Xin Jiang1, Junwei Zhou1, Xinke Zhong1

  • 1MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou310058, China.

ACS Applied Materials & Interfaces
|February 6, 2023
PubMed
Summary

New stretchable electromagnetic interference (EMI) shielding composite films were developed using lithium bis(trifloromethanesulfonyl)imide (Li-TFSI)-doped poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) and rubber latex. These materials offer high EMI shielding efficiency for flexible electronics.

Keywords:
EMILi-TFSIPEDOT:PSSXSBstretchable

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Stretchable electromagnetic interference (EMI) shielding materials are crucial for advanced wearable and flexible electronic devices.
  • Existing materials often lack sufficient conductivity, stretchability, or cost-effectiveness for widespread adoption.

Purpose of the Study:

  • To develop highly stretchable and efficient EMI shielding composite films.
  • To investigate the effect of lithium bis(trifloromethanesulfonyl)imide (Li-TFSI) doping on PEDOT:PSS within a rubber matrix for EMI shielding applications.

Main Methods:

  • Preparation of composite films using Li-TFSI-doped PEDOT:PSS and carboxylated styrene-butadiene rubber (XSB) latex.
  • Characterization of film morphology, conductivity, and EMI shielding performance at various strain levels.
  • Comparison with films using traditional dopants like ethylene glycol.

Main Results:

  • The Li-TFSI-doped PEDOT:PSS/XSB films exhibited tenuous conductive pathways, enhancing EMI shielding efficiency (EMI SE).
  • Films with 6 wt % PEDOT:PSS and 6 wt % Li-TFSI achieved EMI SE of 50 dB (0% strain) and 30 dB (100% strain) at 12.4 GHz.
  • These results represent some of the highest EMI SE values reported for stretchable composites, excluding liquid metal-based materials.

Conclusions:

  • The developed composite films offer a promising solution for lightweight, stretchable EMI shielding.
  • The simple and environmentally friendly preparation method facilitates future development of materials for flexible electronics.
  • The Li-TFSI-doped PEDOT:PSS/XSB system demonstrates superior performance compared to traditional doping methods.