Journal of Coatings Technology and Research

, Volume 7, Issue 2, pp 261–269 | Cite as

CO2-laser treatment of indium tin oxide nanoparticle coatings on flexible polyethyleneterephthalate substrates

  • Tobias Königer
  • Thomas Rechtenwald
  • Ihab Al-Naimi
  • Thomas Frick
  • Michael Schmidt
  • Helmut Münstedt
Article

Abstract

A CO2-laser treatment was used to improve the electrical conductivity of coatings of indium tin oxide (ITO) nanoparticles on flexible polyethyleneterephthalate (PET) substrates. The electrical conductivity and the transparency of CO2-laser-treated ITO nanoparticle coatings were characterized with regard to the application as transparent electrodes. Furthermore, the stability of the electrical conductivity under oscillatory bending was investigated. A specific resistance of 0.12 Ω cm is obtained by CO2-laser treatment without thermally damaging the PET film. The improvement of the electrical conductivity can be explained by a slight sinter neck formation. For a film thickness of 3 μm, a sheet resistance of 400 Ω/□ and a transmission in the visible range of 80% were achieved. The stability of the electrical conductivity of CO2-laser-treated ITO nanoparticle coatings under bending was investigated using a specially constructed device for the application of various oscillatory bending loads. For a bending radius of 10 mm, the sheet resistance does not exceed 1000 Ω/□ after 300 bending cycles. Compared to commercial sputtered ITO coatings, CO2-laser-treated ITO nanoparticle coatings show a significant higher stability under oscillatory bending.

Keywords

Indium tin oxide (ITO) Nanoparticles Laser treatment Oscillatory bending tests 

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Copyright information

© FSCT and OCCA 2009

Authors and Affiliations

  • Tobias Königer
    • 1
  • Thomas Rechtenwald
    • 2
  • Ihab Al-Naimi
    • 1
  • Thomas Frick
    • 2
  • Michael Schmidt
    • 2
  • Helmut Münstedt
    • 1
  1. 1.Institute of Polymer MaterialsErlangenGermany
  2. 2.Bayerisches Laserzentrum GmbHErlangenGermany

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