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A Fabrication Method for Highly Stretchable Conductors with Silver Nanowires
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Mechanochromic Stretchable Electronics.

Meredith H Barbee1, Kunal Mondal, John Z Deng1

  • 1Department of Chemistry , Duke University , Durham , North Carolina 27708 , United States.

ACS Applied Materials & Interfaces
|August 10, 2018
PubMed
Summary
This summary is machine-generated.

New stretchable electronics visually signal when they are nearing failure. By incorporating molecular mechanochromes, these devices change color to warn users, preventing damage and improving control in wearable tech and soft robotics.

Keywords:
liquid metalmechanochromismpolymer mechanochemistrysilicone elastomersstretchable electronics

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Mechanical Engineering

Background:

  • Soft and stretchable electronics are vital for applications like wearable devices and soft robotics.
  • Current devices can fail if stretched beyond their limits, lacking clear indicators of strain.
  • Mechanochromic materials change color in response to mechanical stress, offering potential visual feedback.

Purpose of the Study:

  • To develop functional composites that couple stretchable electronic properties with molecular mechanochromic function.
  • To create visual cues for user control and to prevent catastrophic failure of stretchable devices.
  • To enable at-a-glance monitoring of strain thresholds in soft electronic systems.

Main Methods:

  • Covalently incorporating a spiropyran mechanophore into poly(dimethylsiloxane) (PDMS).
  • Developing colorimetric elastomers that change color upon reaching a critical strain threshold.
  • Fabricating composite materials by layering silicones with different elastic moduli.
  • Integrating these mechanochromic elastomers with stretchable liquid metal antennas.

Main Results:

  • Demonstrated a visible color change in PDMS upon reaching a strain threshold, indicating potential failure.
  • Engineered patterned elastomers (e.g., displaying "STOP") for clear user warnings.
  • Showcased control over the strain at which color change occurs by adjusting material layering.
  • Tailored color onset to signal when a specific frequency was reached in a stretchable antenna.

Conclusions:

  • The combination of mechanochromism and soft electronics provides a novel method for user control.
  • Visual feedback from colorimetric elastomers enhances safety and functionality of stretchable devices.
  • This approach offers a new pathway for designing user-aware, strain-dependent soft electronic systems.