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Electrically Conducting Elastomeric Fibers with High Stretchability and Stability.

Sepideh Zokaei1, Mariavittoria Craighero1, Claudia Cea2

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Researchers developed highly stretchable conducting fibers from conjugated polymers for wearable electronics. These fibers offer record conductivity and stability, enabling advanced strain sensing applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Stretchable conducting materials are crucial for unobtrusive wearable electronics.
  • Conjugated polymers with oligoethylene glycol side chains offer low elastic modulus and good compatibility with polar polymers.

Purpose of the Study:

  • To develop highly stretchable and conductive elastomeric blend fibers.
  • To investigate the properties and potential applications of these novel fibers.

Main Methods:

  • Wet spinning of a blend of doped polar polythiophene with tetraethylene glycol side chains and polyurethane.
  • Chemical doping with iron(III) p-toluenesulfonate hexahydrate.
  • Characterization of fiber properties including stretchability, conductivity, and cyclic stability.

Main Results:

  • Continuous fibers (30-70 µm diameter) with high stretchability (up to 480%) and electrical conductivity (up to 7.4 S cm⁻¹).
  • Fibers maintain conductivity during elongation and exhibit excellent long-term stability.
  • High cyclic stability demonstrated through 400 strain cycles at 50% strain.
  • Demonstration of a directional strain sensing device utilizing the fiber's resistance change.

Conclusions:

  • The developed fibers represent a record combination of stretchability and conductivity for conjugated polymer-based materials.
  • These fibers are promising for advanced wearable electronic devices and strain sensing applications.
  • The wet-spinning process offers a versatile, scalable method for producing these functional fibers.