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Preparing Polypyrrole-Coated Stretchable Textile via Low-Temperature Interfacial Polymerization for Highly Sensitive

Xiaodie Chen1,2, Bintian Li1,2, Yan Qiao1,2

  • 1Key Laboratory of Luminescent and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, School of Materials & Energy, Southwest University, Chongqing 400715, China.

Micromachines
|November 21, 2019
PubMed
Summary

A new polypyrrole-coated textile sensor offers high sensitivity and flexibility for wearable devices. This conductive strain sensor accurately monitors human motion and respiration, showing great potential for physiological monitoring.

Keywords:
human motionlow-temperature interfacial polymerizationstrain sensortextilewearable electronics

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Area of Science:

  • Materials Science
  • Textile Engineering
  • Wearable Technology

Background:

  • Wearable devices require highly sensitive, flexible strain sensors.
  • Developing textile-based sensors with large dynamic range and skin affinity remains challenging.

Purpose of the Study:

  • To develop a highly sensitive and stretchable textile-based strain sensor.
  • To enable real-time measurement of human motion and respiration using wearable sensors.

Main Methods:

  • Polypyrrole (PPy) was coated onto a polyester-spandex textile via low-temperature interfacial polymerization.
  • Characterization included scanning electron microscopy, Fourier transform infrared spectrometry, and thermal gravimetric analysis.
  • The sensor's performance was evaluated for strain sensing, durability, and real-world human motion and respiration monitoring.

Main Results:

  • Uniform and dense PPy coating on the textile was confirmed.
  • The sensor demonstrated excellent flexibility, tolerating 180° folding and 500 bending-twisting cycles.
  • A negative correlation between resistance and strain (0-71%) with a gauge factor of -0.46 was observed.
  • The sensor showed stable performance after over 200 stretching-releasing cycles.
  • Real-time monitoring of finger, elbow, and knee movements, as well as breathing patterns, was successfully achieved.

Conclusions:

  • The PPy-coated textile sensor exhibits high sensitivity, flexibility, and durability.
  • This approach provides a viable method for creating advanced conductive polymer-coated textiles for wearable applications.
  • The developed sensor holds significant potential for practical use in monitoring human physiological signs and movements.