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This study introduces a novel fiber actuator that changes color and generates electricity in response to volatile organic compounds (VOCs). This dual-mode sensing enables soft robots to autonomously detect and identify chemical hazards in real-time.

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Area of Science:

  • Materials Science
  • Robotics
  • Chemical Sensing

Background:

  • Soft robots offer potential for dynamic hazard detection through volatile organic compound (VOC) sensing.
  • Integrating VOC-responsive actuation with autonomous perception in soft robots remains a significant challenge.

Purpose of the Study:

  • To develop a novel material and actuator for simultaneous visual and electrical perception of VOCs.
  • To create a VOC-responsive soft robot capable of autonomous hazard detection and response.

Main Methods:

  • Synthesized a solvatophore-induced solvatochromic-piezoelectric material by modifying palygorskite-enhanced polyvinylidene difluoride with a solvatochromic molecule.
  • Fabricated a VOC-responsive all-fiber actuator exhibiting solvatochromic and piezoelectric properties.
  • Demonstrated cooperative visual and electrical perception of volatile organics.

Main Results:

  • The actuator showed bidirectional bending, stable color change, and characteristic piezoelectric output upon exposure to VOCs.
  • Achieved a large bending curvature (4.63 cm⁻¹) and ultrafast response speed (4.36 cm⁻¹ s⁻¹).
  • Demonstrated excellent stability over 1500 actuation cycles without fatigue, with synchronous piezoelectric output reflecting actuation conditions.

Conclusions:

  • The developed solvatochromic-piezoelectric actuator enables effective identification of VOC type and concentration.
  • The VOC-triggered soft robot exhibits stable motion and autonomous environmental perception.
  • Presents a versatile visual-electronic VOC detection strategy for safety, health, and environmental protection, inspiring new responsive fiber materials.