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An Ultra-Thin Stretchable Electrode Based on High-Resilient Polyurethane Crosslinked with La3+-Complexes.

Qi-Sheng Huang1, Ruohan Yang1, Zhi-Dong Yang1

  • 1State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Department of Polymer Science and Engineering, Key Laboratory of High-Performance Polymer Material and Technology, MOE, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210023, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
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Summary

A new elastomer using lanthanum (III) complexes offers superior resilience and fatigue resistance for stretchable electronics. This material enables durable, high-performance electronic skins for advanced healthcare and robotics applications.

Keywords:
high‐resilientlanthanide coordination bondstretchable electronicswoven structure

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Stretchable electronic skins are crucial for smart healthcare, wearable electronics, and robotics.
  • Common thermoplastic elastomers suffer from hysteresis and fatigue, limiting their durability.
  • Developing robust elastomers is key to advancing stretchable electronic applications.

Purpose of the Study:

  • To engineer a highly resilient and fatigue-resistant elastomer for stretchable electronics.
  • To investigate the use of lanthanum (III) complexes as crosslinkers for enhanced material properties.
  • To fabricate and test flexible electrodes for physiological signal monitoring.

Main Methods:

  • Synthesized a novel elastomer using lanthanum (III) complexes as crosslinkers.
  • Characterized the elastomer's mechanical strength, resilience, and fatigue resistance.
  • Fabricated ultra-thin flexible electrodes from the developed elastomer for physiological monitoring.

Main Results:

  • The new elastomer exhibits exceptional mechanical strength (Young's modulus ≈3.47 MPa, maximum stress ≈16.52 MPa).
  • Demonstrated high resilience (residual strain ≈8% at 100% strain) and fatigue resistance (≈90% strength retention after 2000 cycles).
  • Stable thermomechanical properties were observed, with low creep and residual strain at elevated temperatures.
  • Fabricated electrodes enabled stable, long-term monitoring of human physiological signals.

Conclusions:

  • Lanthanum (III) complex crosslinking creates a woven structure that significantly enhances elastomer performance.
  • The developed elastomer offers a promising solution for durable and high-performance stretchable electronic skins.
  • This material advancement supports applications in wearable health monitoring and human-machine interfaces.