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Laser patterning of highly conductive flexible circuits.

Seok Young Ji1,2, C Muhammed Ajmal3, Taehun Kim4

  • 1Department of Nano Mechanics, Nanomechanical Systems Research Division, Korea Institute of Machinery and Materials, 156 Gajeongbuk-Ro, Yuseong-Gu, Daejeon 305-343, Republic of Korea.

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Researchers developed a new laser sintering technique for creating conductive flexible adhesive (CFA) micro-circuits. This method enables mask-free patterning and curing, paving the way for advanced flexible electronic devices.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrical Engineering

Background:

  • Conductive flexible adhesive (CFA) materials are crucial for flexible electronics.
  • Existing patterning technologies for micro-scale electrodes and circuits require further development.

Purpose of the Study:

  • To develop a mask-free selective laser sintering technology for patterning CFA materials.
  • To enable simultaneous patterning and curing of micro-scale electrodes and circuits.

Main Methods:

  • Developed a CFA composed of Ag flakes, Ag-decorated carbon nanotubes, and a nitrile-butadiene-rubber matrix on a PET substrate.
  • Utilized selective laser sintering with controlled laser beam parameters (50 mW, 1 mm/s) for mask-free patterning.
  • Investigated conductivity, stability, flexibility, and adhesion of the laser-sintered patterns.

Main Results:

  • Achieved high conductivity of 25,012 S cm⁻¹.
  • Demonstrated excellent conductivity stability in ambient and humid conditions.
  • Exhibited superior flexibility with normalized resistance change < 1.2 at a 5 mm bending radius.
  • Showcased excellent cyclability and adhesion of laser-sintered patterns.
  • Fabricated a functional flexible circuit for operating LEDs during bending.

Conclusions:

  • Selective laser sintering is a viable mask-free technique for fabricating micro-scale patterns with CFA materials.
  • The developed method offers high conductivity, stability, and mechanical robustness for flexible electronics.
  • The technology shows significant potential for practical applications in flexible electronic devices.