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A Simple and Scalable Fabrication Method for Organic Electronic Devices on Textiles
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Laser-Engraved Liquid Metal Circuit for Wearable Electronics.

Shuting Liang1,2, Xingyan Chen1, Fengjiao Li3

  • 1College of Chemical and Environmental Engineering, Chongqing University of Arts and Sciences, Chongqing 402160, China.

Bioengineering (Basel, Switzerland)
|February 24, 2022
PubMed
Summary

A new laser engraving method creates custom liquid metal electronic circuits quickly and affordably. This technology fabricates precise, high-resolution patterns on flexible substrates for advanced electronic devices.

Keywords:
flexible electronicslaser engravingliquid metalwearable electronics

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Area of Science:

  • Materials Science
  • Microfabrication
  • Electronics Engineering

Background:

  • Conventional methods for liquid metal (LM) circuit fabrication, like template methods, involve chemical etching, leading to long processing times, high costs, and complex multi-step procedures.
  • These limitations hinder the rapid and cost-effective production of customized LM electronic circuits.

Purpose of the Study:

  • To introduce a novel, reliable laser engraving micro-fabrication technology for personalized liquid metal electronic circuits.
  • To demonstrate the capability of this method for creating high-resolution LM patterns on various substrates.

Main Methods:

  • A digital pattern was used to guide a laser in burning grooves into a polyethylene (PE) film on a polydimethylsiloxane (PDMS) or paper substrate.
  • Liquid metal was then introduced into the grooves, followed by removal of the PE film and encapsulation with a PDMS film.

Main Results:

  • Precise patterned LM electronic circuits, including serpentine and Peano curves, were successfully fabricated.
  • The minimum width and height of LM circuits achieved were 253 μm and 200 μm, respectively, with a minimum height of 26 μm on paper.
  • The fabricated LM flexible circuits were integrated into a sensor device for successful heart rate detection.

Conclusions:

  • Laser engraving offers a rapid, customizable, and high-resolution approach for fabricating LM circuit patterns.
  • This micro-processing technology shows significant potential for the manufacturing of flexible electronic equipment and sensor devices.