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A Fabrication Method for Highly Stretchable Conductors with Silver Nanowires
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Screen-Printed Corrosion-Resistant and Long-Term Stable Stretchable Electronics Based on AgAu Microflake Conductors.

Ulrika Boda1,2, Jan Strandberg1, Jens Eriksson3

  • 1Bio and Organic Electronics Unit, Department of Smart Hardware, Digital Systems Division, RISE Research Institutes of Sweden AB, 602 21 Norrköping, Sweden.

ACS Applied Materials & Interfaces
|February 23, 2023
PubMed
Summary

Researchers developed cost-effective, screen-printable inks using gold-coated silver flakes for stable, stretchable electronics. These new conductors offer excellent conductivity and durability for wearable devices like LED and NFC circuits.

Keywords:
NFCcorrosiongoldprinted electronicssilver flakessoft electronicsstabilitystretchable electronics

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrical Engineering

Background:

  • Stretchable electronics require stable conductive inks for commercial viability.
  • Current silver-based inks suffer from degradation due to tarnishing and corrosion.
  • High-throughput methods like screen printing are crucial for market adoption.

Purpose of the Study:

  • To develop a cost-efficient and scalable method for producing stable, screen-printable stretchable conductors.
  • To enhance the durability and reliability of silver-based conductive inks.
  • To enable the practical application of stretchable electronics in wearable devices.

Main Methods:

  • Chemically coating silver flakes with a thin layer of gold.
  • Formulating screen-printable inks using these AgAu flakes.
  • Testing the conductivity, strain tolerance, and stability of printed conductors.
  • Demonstrating functional wearable circuits (LED, NFC).

Main Results:

  • Achieved conductivity of 8500 S cm-1 in printed stretchable AgAu conductors.
  • Conductors maintained conductivity up to 250% strain.
  • Demonstrated excellent resistance to corrosion and tarnishing.
  • Successfully fabricated wearable LED and NFC circuits.

Conclusions:

  • Gold-coated silver flakes provide a scalable and cost-effective solution for stable stretchable conductors.
  • The developed inks are suitable for high-throughput manufacturing via screen printing.
  • This approach enhances the long-term functionality of wearable electronics in diverse environments.