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Bubble Printing of Liquid Metal Colloidal Particles for Conductive Patterns.

Masaru Mukai1, Tatsuya Kobayashi2, Mitsuki Sato2

  • 1Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.

Nanomaterials (Basel, Switzerland)
|October 25, 2024
PubMed
Summary
This summary is machine-generated.

This study demonstrates bubble printing for liquid metal wiring using eutectic gallium–indium alloy (EGaIn) colloidal particles. The method achieves fine, conductive, and flexible liquid metal patterns on glass substrates.

Keywords:
bubble printingconductive patternseutectic gallium–indium alloysfemtosecond laserflexible wireslaser direct writingliquid metal

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Additive Manufacturing

Background:

  • Bubble printing enables high-speed, high-precision patterning of micro/nanoparticles.
  • Previous research primarily focused on patterning solid particles, with limited exploration of liquid particle patterning.

Purpose of the Study:

  • To fabricate liquid metal wiring patterns using bubble printing with eutectic gallium–indium alloy (EGaIn) colloidal particles.
  • To enhance the conductivity of the fabricated patterns through a galvanic replacement process.
  • To evaluate the flexibility and conductivity of the resulting liquid metal wiring.

Main Methods:

  • Utilizing a femtosecond laser to generate microbubbles for fixing EGaIn colloidal particles (≈0.7 µm diameter) on a glass substrate.
  • Employing galvanic replacement to substitute gallium oxide with silver, rendering the wiring conductive.
  • Optimizing laser power to achieve fine, continuous liquid metal lines with a width of 3.4 µm.

Main Results:

  • Successfully fabricated continuous liquid metal wiring patterns with a line width of 3.4 µm.
  • Achieved a conductivity of approximately 1.5 × 10^5 S/m for the liquid metal wiring.
  • Demonstrated consistent conductivity even when the glass substrate was bent to a curvature of 0.02 m⁻¹.

Conclusions:

  • Bubble printing is a viable method for fabricating flexible liquid metal wiring patterns.
  • The combination of bubble printing and galvanic replacement offers a promising route for creating conductive micro/nanoscale structures.
  • The developed technique holds potential for applications requiring flexible and conductive materials.