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One-step 3D shrinking method to prepare robust and multifunctional flexible strain sensor with brain cortex-like

Xuemei Zhang1, Hongwei Li2, Guang Wang3

  • 1College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China; College of Chemistry and Chemical Engineering, Yan'an University, Yan'an 716000, China.

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|April 8, 2025
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Summary

Researchers developed a novel brain cortex-inspired wrinkled strain sensor using a 3D shrinking method. This flexible sensor offers high sensitivity, a wide strain range, and robust durability for advanced flexible electronics.

Keywords:
3D-shrinkingBrain cortex-like wrinkled structureCarbon nanotubesMultifunctional flexible sensorSuperhydrophobic

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Area of Science:

  • Materials Science
  • Flexible Electronics
  • Nanotechnology

Background:

  • Flexible electronics require strain sensors with integrated functions, high sensitivity, wide strain range, and stability in harsh environments.
  • Existing sensors struggle to meet these demands due to challenges in fabrication and material integration.

Purpose of the Study:

  • To develop a facile, transfer-free method for fabricating high-performance flexible strain sensors.
  • To create a sensor with enhanced mechanical properties, self-cleaning functionality, and durability.

Main Methods:

  • A one-step 3D shrinking approach was employed, inspired by the brain cortex's wrinkled structure.
  • A conductive layer was sprayed onto a pre-inflated latex balloon, which then deflated to create an intertwined, wrinkled conductive layer.
  • The sensor's properties were characterized, including response time, gauge factor, strain range, and durability under various conditions.

Main Results:

  • The fabricated sensor exhibited a hierarchical micro-nano wrinkled structure with robust anchoring.
  • Achieved a high water contact angle (168.4°) for self-cleaning and superhydrophobicity.
  • Demonstrated a rapid response time (100 ms), high gauge factor (2653.3), and a broad strain range (0.1–191%).
  • Maintained excellent stability and durability after rigorous testing, including water scouring and 30,000 stretch-release cycles.

Conclusions:

  • The brain cortex-like wrinkled structure provides a simple and universal fabrication method for high-performance flexible strain sensors.
  • The sensor's unique structure and properties enable dynamic monitoring of human movements, airflow, and environmental conditions.
  • This work offers valuable insights for the advancement of next-generation flexible electronic devices.