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Electrical Resistance Reduction Induced with CO2 Laser Single Line Scan of Polyimide.

Zhongke Wang1,2, Kok Keat Tan2, Yee Cheong Lam1,3

  • 1SIMTech-NTU Joint Laboratory (Precision Machining), Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.

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|March 6, 2021
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Summary

This study shows that high electrical conductivity in polyimide films is achieved by focusing CO2 laser power at the line center, creating graphene structures. Optimal conductivity requires sufficient laser power in a single scan, not low power with multiple passes.

Keywords:
CO2 laser irradiationMicroRaman spectraelectrical conductivitygraphene structurepolyimide film

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Area of Science:

  • Materials Science
  • Laser Physics
  • Surface Engineering

Background:

  • Polyimide films are widely used in electronics but often lack inherent electrical conductivity.
  • Developing methods for surface modification to induce electrical conductivity is crucial for advanced applications.
  • Laser-induced transformations offer a precise route for material property enhancement.

Purpose of the Study:

  • To investigate the effect of CO2 laser parameters on inducing electrical conductivity in polyimide films.
  • To understand the microstructural changes responsible for laser-induced conductivity.
  • To determine optimal laser processing conditions for achieving high electrical conductivity.

Main Methods:

  • Laser parameter study using a CO2 laser on polyimide films.
  • MicroRaman spectroscopy for material characterization.
  • Electrical resistance measurements to quantify conductivity.

Main Results:

  • Electrical conductivity was localized at the center of the laser-scanned line.
  • MicroRaman analysis revealed multi-layered graphene structures (4-5 layers) at the conductive sites.
  • High conductivity was achieved with sufficient laser power (e.g., 24 W) in a single scan, independent of pulse frequency.
  • Low power (<5 W) with high speed (>22.5 mm/s) or multiple scans were inefficient for conductivity.

Conclusions:

  • CO2 laser irradiation can effectively transform polyimide surfaces into conductive graphene structures.
  • Sufficient laser power and energy density are critical for achieving high electrical conductivity in a single pass.
  • Optimized laser processing provides a viable method for creating conductive pathways on polyimide substrates.