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Coffee Ring Effect Induced Selective Wetting of Liquid Metal for High-Resolution Stretchable Bioelectrodes.

Jianhui Chen1, Gongwei Tian2,3, Dan Yang1

  • 1MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, National and Local Joint Engineering Laboratory for Synthesis Transformation and Separation of Extreme Environmental Nutrients, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.

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Summary

Researchers developed high-resolution, multichannel liquid metal (LM) bioelectrodes for stretchable electronics. This novel method overcomes LM surface energy challenges, enabling advanced applications in bio-sensing and flexible devices.

Keywords:
Ag NPscoffee ring effecthigh-resolution bioelectrodeliquid metalstretchable electrode

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Area of Science:

  • Materials Science
  • Bioelectronics
  • Nanotechnology

Background:

  • Liquid metals (LM) offer promise for stretchable bioelectronic devices due to their conductivity and deformability.
  • High surface energy of LMs hinders the fabrication of high-resolution, multichannel bioelectrodes.

Purpose of the Study:

  • To develop high-resolution (10 μm) and multichannel (16-channel) LM bioelectrodes.
  • To overcome fabrication challenges associated with LM surface energy for advanced bioelectronic applications.

Main Methods:

  • Aligned silver nanoparticles (Ag NPs) using the coffee ring effect to guide LM.
  • Utilized selective wetting of LM on Ag NPs for precise electrode patterning.
  • Encapsulated recording sites with conductive ionic gel to reduce impedance.

Main Results:

  • Achieved high-resolution (10 μm) and multichannel (16-channel) LM bioelectrode arrays.
  • Demonstrated excellent tensile conductivity (600% strain) and cyclic stability (10,000 cycles at 100% strain).
  • Reduced interfacial impedance to 4.14 kΩ (1 kHz) and ensured 35-day electrode stability.

Conclusions:

  • The study presents a viable strategy for fabricating high-resolution, stretchable LM electrodes.
  • The developed bioelectrodes enable high-quality electrophysiological signal acquisition.
  • Successful application in human motion detection, handwriting recognition, and Joule heating highlights their potential in flexible electronics.