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Liquid Metal Fibers with a Knitted Structure for Wearable Electronics.

Bingyi Ping1, Zihang Zhang1, Qiushi Liu1

  • 1Department of Biomedical Engineering, Tianjin University, Tianjin 300072, China.

Biosensors
|July 28, 2023
PubMed
Summary

Researchers developed durable, stretchable liquid metal conductive fibers using a knitted structure. These fibers maintain conductivity under tension and enable functional flexible electronics like washable LED arrays and ECG monitoring garments.

Keywords:
conductive fibersknitted structureliquid metalmicrochannel injectionwearable electronics

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Textile Engineering

Background:

  • Flexible conductive materials are crucial for wearable electronics, but often compromise conductivity or stretchability.
  • Existing materials struggle to meet the demands of applications like health monitoring and robotics.

Purpose of the Study:

  • To introduce a novel knitted structure of liquid metal conductive fibers.
  • To evaluate the electrical and mechanical properties of these new fibers.
  • To demonstrate their integration into functional electronic devices.

Main Methods:

  • Fabrication of liquid metal conductive fibers in a knitted structure.
  • Tensile testing to assess resistance variation under strain.
  • Cyclic tensile testing to evaluate durability (1300 cycles).
  • Integration with rigid components for LED arrays and ECG monitoring garments.

Main Results:

  • The knitted structure significantly reduced resistance variation under tension.
  • Fibers showed excellent durability with <3% resistance increase after 1300 cycles.
  • Integrated devices, including an LED array and ECG garment, demonstrated stable functionality after washing and daily use.

Conclusions:

  • The liquid metal knitted fibers offer a promising solution for high-performance flexible conductive materials.
  • These fibers enable robust, water-resistant flexible electronics for applications in physiological monitoring and human-machine interaction.