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Self-Organizing, Environmentally Stable, and Low-Cost Copper-Nickel Complex Inks for Printed Flexible Electronics.

Wanli Li1,2,3, Lingying Li4,5, Fei Li1,2

  • 1Center of Micro-Nano Engineering, School of Mechanical Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China.

ACS Applied Materials & Interfaces
|February 1, 2022
PubMed
Summary

Stable and cost-effective copper-nickel conductive inks offer a promising alternative for printed electronics. These inks enable low-temperature processing and photon sintering for reliable, flexible electronic devices.

Keywords:
conductive inkscopper@nickel core−shell structurescopper−nickel complex inksoxidation resistancephotonic sinteringprinted flexible electronicsself-organized process

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electronics Engineering

Background:

  • Silver conductive inks are expensive for printed electronics.
  • Copper conductive inks face challenges with stability and high sintering temperatures.
  • Need for cost-effective, stable conductive inks for flexible electronics.

Purpose of the Study:

  • To develop stable, cost-effective copper-nickel complex inks for printed electronics.
  • To enable low-temperature processing and photon sintering of copper-based conductive patterns.
  • To enhance the performance and reliability of flexible electronic devices.

Main Methods:

  • Synthesis of rapidly customizable, particle-free copper-nickel complex inks.
  • In situ formation of copper@nickel core-shell nanostructures during low-temperature annealing.
  • Photon irradiation for immediate sintering into copper-nickel alloy patterns on flexible substrates.

Main Results:

  • Copper-nickel alloy patterns achieved high conductivity (19-67 μΩ·cm).
  • Excellent oxidation resistance at 180 °C, even with low nickel content (6 wt %).
  • Demonstrated high flexibility and mechanical anchoring on flexible substrates.

Conclusions:

  • The developed copper-nickel complex inks are suitable for large-area screen printing and additive manufacturing.
  • These inks offer a viable, cost-effective alternative to silver inks for high-performance flexible electronics.
  • Potential applications include flexible radio-frequency identification (RFID) tags and wearable sensors.