Elastic conducting polymer composites in thermoelectric modules

Area of Science:

• Materials Science
• Polymer Science
• Energy Harvesting

Background:

• Wearable devices require lightweight, elastic energy harvesting and storage solutions.
• Conducting polymers like poly(3,4-ethylenedioxythiophene) (PEDOT) show potential for thermoelectric generators but lack mechanical flexibility.
• Existing PEDOT-elastomer composites struggle to balance softness, conductivity, and stretchability.

Purpose of the Study:

• To develop a highly conductive, elastic, and stretchable material for wearable thermoelectric applications.
• To overcome the limitations of pristine PEDOT and current composites for seamless integration into wearables.

Main Methods:

• Aqueous processing of a poly(3,4-ethylenedioxythiophene)-polyurethane-ionic liquid composite.
• Characterization of electrical conductivity, stretchability, elasticity, and Young's modulus.
• Fabrication of an intrinsically stretchable organic thermoelectric module.

Main Results:

• Achieved high conductivity (>140 S cm^-1) and superior stretchability (>600%).
• Demonstrated low Young's modulus (<7 MPa), indicating significant softness and elasticity.
• Successfully implemented the material in the first intrinsically stretchable organic thermoelectric module.

Conclusions:

• The developed PEDOT-based composite overcomes previous limitations, offering a promising solution for wearable energy harvesting.
• The material's unique properties stem from nano-/micro-scale percolation networks and the plasticizing effect of ionic liquid.
• This advancement paves the way for next-generation flexible and wearable electronic devices.