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Wrinkled titanium nitride nanocomposite for robust bendable electrodes.

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  • 1Instituto de Física, Pontificia Universidad Catolica de Chile, Avenida Vicuña Mackenna 4860, Santiago, Chile.

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|September 5, 2019
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Researchers developed robust, bendable coatings using titanium nitride (TiN) and silver nanowires (Ag NWs) for wearable electronics. These TiN-Ag NWs nanocomposites offer superior electro-mechanical properties compared to traditional materials.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrical Engineering

Background:

  • Electrical contacts are essential for electronic devices, with a growing need for flexible and durable electrodes in wearable technology.
  • Existing materials like Indium Tin Oxide (ITO) and silver nanowires (Ag NWs) have limitations in terms of mechanical robustness or conductivity for demanding flexible applications.

Purpose of the Study:

  • To develop and characterize novel, robust, and bendable coatings for flexible electronic applications.
  • To investigate the electro-mechanical properties of titanium nitride (TiN) and silver nanowire (Ag NW) nanocomposites for enhanced performance.

Main Methods:

  • Fabrication of TiN and TiN-AgNWs nanocomposite coatings on polyethylene terephthalate (PET) substrates using plasma enhanced pulsed laser deposition (PLD).
  • Tuning sheet resistance via dual-frequency PLD and Ag NW incorporation.
  • In-situ four-probe resistance measurements during cyclic bending tests to evaluate electro-mechanical robustness.

Main Results:

  • Achieved low sheet resistance down to [Formula: see text] Ω/□ for TiN-AgNWs nanocomposites.
  • Demonstrated superior electro-mechanical robustness compared to ITO and Ag NWs coatings.
  • Nanocomposites withstood high strain fatigue loading (up to 2.6%) with sheet resistance below 5 Ω/□ and minimal optical transmittance decrease (≈11%).

Conclusions:

  • TiN-AgNWs nanocomposites are promising materials for flexible electronic devices due to their excellent conductivity and mechanical stability.
  • Incorporation of Ag NWs into TiN coatings effectively enhances mechanical robustness and limits crack propagation.
  • These findings pave the way for advanced wearable electronics with improved durability and performance.