Laser-Induced Graphene on Polyimide: Material Characterization Toward Strain-Sensing Applications

Area of Science:

• Materials Science
• Nanotechnology
• Sensor Technology

Background:

• Laser-induced graphene (LIG) fabrication is a promising method for creating advanced materials.
• Graphene-based strain sensors require specific properties like conductivity and mechanical stability for effective deformation sensing.

Purpose of the Study:

• To investigate the influence of laser power, focal length, and number of passes on LIG strain sensor fabrication.
• To optimize the LIG process for enhanced sensor performance, including conductivity, mechanical stability, and sensitivity.

Main Methods:

• Fabrication of graphene on polyimide substrates using a 450 nm diode laser.
• Morphological analysis via Scanning Electron Microscopy (SEM) and Raman spectroscopy.
• Electrical characterization using the Van der Pauw method and three-point bending tests.

Main Results:

• Laser power significantly impacts graphene quality and sensor performance.
• Focal length showed a negligible effect on sensor characteristics.
• Increased laser passes degraded material quality and reduced sensor sensitivity.

Conclusions:

• Laser power is the critical parameter for fabricating high-performance graphene strain sensors.
• A commercial diode laser can be used for scalable and affordable LIG strain sensor production.
• This method presents a viable, cost-effective alternative for sensor fabrication.