Near-Infrared Laser Direct Writing of Conductive Patterns on the Surface of Carbon Nanotube Polymer Nanocomposites

Gerges El Haber, Laurent Noel, Ching Fu Lin, Simon Gree, Loïc Vidal, Hsiao Wen Zan, Nelly Hobeika, Olivier Lhost, Yves Trolez, Olivier Soppera*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Near-infrared (NIR) laser annealing is used to write conductive patterns on the surface of polypropylene/multi-walled carbon nanotube nanocomposite (PP/MWCNT) plates. Before irradiation, the surface of the nanocomposite is not conductive due to the partial alignment of the MWCNT, which occurs during injection molding. We observe a significant decrease in the surface sheet resistance using NIR laser irradiation, which we explain by a randomization of the orientation of MWCNTs in the PP matrix melt by NIR laser irradiation. After only 5 s of irradiation, the sheet resistance of PP/MWCNTs, annealed with a laser at a power density of 7 W/cm2, decreases by more than 4 decades from ∼100 Mω/sq to ∼1 kω/sq. Polarized Raman, TEM, and SEM are used to investigate the changes in the sheet resistance and confirm the physico-chemical processes involved. This allows direct writing of conductive patterns using a NIR laser on the surface of nanocomposite polymer substrates, with the advantages of a fast, easy, and low-energy consumption process.

Original languageEnglish
Pages (from-to)49279-49287
Number of pages9
JournalACS Applied Materials and Interfaces
Issue number41
StatePublished - 20 Oct 2021


  • carbon nanotubes
  • conductive polymer
  • laser treatment
  • nanocomposite
  • near-infrared


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