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Enhanced Electrical Performance and Stretchability by Plasticizer-Facilitated PEDOT:PSS Self-Alignment.

Carla Volkert1, Mateusz Brzezinski2,3, Pablo Gomez Argudo3

  • 1Organic Bioelectronics Research Group, Max Planck Institute for Polymer Research, 55128, Mainz, Germany.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|May 9, 2025
PubMed
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Organic plasticizers enhance stretchable conductive polymers like PEDOT:PSS for wearable electronics. This study reveals how glycerol plasticizer improves conductivity and strain response in PEDOT:PSS films by altering morphology.

Area of Science:

  • Materials Science
  • Polymer Science
  • Electronics Engineering

Background:

  • Stretchable electronics are crucial for wearable healthcare and biointerfacing.
  • Conductive polymers like poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) are brittle, limiting their application.
  • Organic plasticizers are used to improve polymer stretchability, but their effect on thin-film morphology and electrical properties is not well understood.

Purpose of the Study:

  • To fundamentally explore the relationship between organic plasticizers, morphology, and electrical properties in PEDOT:PSS thin-films.
  • To investigate the diffusion and reorganization of PEDOT and PSS in response to glycerol plasticizer.
  • To understand how plasticizer-induced changes affect conductivity, strain response, and mechanical integrity.

Main Methods:

Keywords:
Flory‐HugginsPEDOT:PSSchain‐alignmentplasticizerstretchable electronics

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  • Utilized a bilayer model with transfer-printed PEDOT:PSS on poly(vinyl alcohol) substrates containing varying concentrations of glycerol (15-55 wt.%).
  • Employed a multicomponent diffusion model to investigate plasticizer diffusion and its effect on PEDOT:PSS morphology.
  • Measured electrical conductivity and resistance changes under strain to evaluate performance.

Main Results:

  • Plasticizer diffusion led to a reorganization of PEDOT and PSS, forming more interconnected PEDOT domains.
  • A plasticizer-dependent increase in conductivity was observed, consistent with the diffusion model predictions.
  • The system exhibited an improved electrical response to strain and crack-free elongation, with resistance decreasing to one-fifth of its initial value due to chain alignment.

Conclusions:

  • Organic plasticizers, specifically glycerol, can significantly enhance the conductivity and stretchability of PEDOT:PSS films.
  • The observed improvements are attributed to plasticizer-induced morphological changes and polymer chain alignment.
  • This research provides a fundamental understanding for designing advanced stretchable conductive materials for wearable electronic applications.