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Carbon-Dots-Induced Microphase-Separated Polypyrrole Hydrogels with Ultrahigh Stretchability and Low Modulus for Soft

Xuan Cao1, Rulong Lv1, Yun Wei1

  • 1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 15 third Ring North East Road, Chaoyang District, Beijing 100029, China.

ACS Applied Materials & Interfaces
|April 23, 2026
PubMed
Summary

Researchers developed advanced conductive hydrogels using carbon dots to improve polypyrrole dispersion. This innovation enhances stretchability, conductivity, and adhesion for flexible electronics and wearable devices.

Keywords:
carbon dotsconductive hydrogelflexible supercapacitorsmicrophase separationstrain sensors

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Flexible electronics require conductive materials with superior mechanical and electrical properties.
  • Existing conductive hydrogels face challenges with poor dispersibility of conductive polymers like polypyrrole (PPy), limiting performance.
  • Simultaneous achievement of high stretchability, low hysteresis, strong adhesion, and stable conductivity in hydrogels remains a significant hurdle.

Purpose of the Study:

  • To develop multifunctional conductive hydrogels with enhanced properties for flexible electronic applications.
  • To overcome the limitations of polypyrrole dispersibility in hydrogel matrices.
  • To explore a novel strategy for creating robust and conductive hydrogel networks.

Main Methods:

  • A carbon dots (CDs)-induced microphase separation strategy was employed.
  • CDs were used to regulate polypyrrole (PPy) polymerization and dispersion within an oxidized hyaluronic acid (OHA)/polyacrylamide (PAM) network.
  • Characterization of the microphase-separated architecture and evaluation of mechanical and electrical properties.

Main Results:

  • The strategy successfully promoted the formation of PPy-rich conductive domains within the OHA/PAM network.
  • The microphase-separated architecture improved interfacial coupling, leading to enhanced electrical continuity and mechanical robustness.
  • The optimized hydrogel achieved a tensile strength of 77.56 kPa, fracture strain >4300%, low energy loss (<11%), and high recovery (>89%).

Conclusions:

  • The carbon dots-induced microphase separation is an effective method for creating multifunctional conductive hydrogels.
  • The developed hydrogel exhibits excellent stretchability, conductivity, and adhesion, addressing key limitations in the field.
  • The POCP hydrogel shows significant potential for applications in wearable strain sensors, bioelectrodes, and flexible supercapacitors.