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A Highly Sensitive and Stretchable Yarn Strain Sensor for Human Motion Tracking Utilizing a Wrinkle-Assisted Crack

Hongling Sun1, Kun Dai1, Wei Zhai1

  • 1School of Materials Science and Engineering, Key Laboratory of Materials Processing and Mold, Ministry of Education; Henan Key Laboratory of Advanced Nylon Materials and Application; National Engineering Research Center for Advanced Polymer Processing Technology , Zhengzhou University , Zhengzhou 450001 , China.

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Summary

A novel wrinkle-assisted crack microstructure in multiwalled carbon nanotubes (CNTs) yarn enhances flexible electronics. This breakthrough offers high sensitivity and a wide strain range for advanced wearable sensors.

Keywords:
carbon nanotubes inkhigh sensitivitywide workable strain rangewrinkle-assisted crack microstructureyarn strain sensor

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Area of Science:

  • Materials Science
  • Flexible Electronics
  • Nanotechnology

Background:

  • Flexible electronics demand high-performance strain sensors.
  • Existing sensors face a trade-off between sensitivity and strain range.
  • Need for stretchable, sensitive strain sensors is critical.

Purpose of the Study:

  • To design and fabricate a novel microstructure for strain sensing.
  • To overcome the sensitivity-strain range trade-off in stretchable sensors.
  • To develop a multifunctional, high-performance strain sensor.

Main Methods:

  • Fabrication of a wrinkle-assisted crack microstructure.
  • Utilizing multiwalled carbon nanotubes (CNTs) ink and polyurethane (PU) yarn.
  • Pre-stretching CNTs ink/PU yarn to induce microstructural changes.

Main Results:

  • Achieved high sensitivity (gauge factor of 1344.1 at 200% strain).
  • Demonstrated an ultralow limit of detection (<0.1% strain).
  • Exhibited excellent durability (>10,000 cycles) and a wide strain range (0-200%).
  • Showcased outstanding response and stability to bending deformation.

Conclusions:

  • The designed microstructure effectively enhances strain sensing performance.
  • This sensor overcomes limitations of previous stretchable strain sensors.
  • Potential applications include intelligent fabrics, electrical skins, and human motion monitoring.