Pattern-Dependent Radio Frequency Heating of Laser-Induced Graphene Flexible Heaters

Area of Science:

• Materials Science
• Nanotechnology
• Electrical Engineering

Background:

• Graphene's high thermal conductivity makes it ideal for flexible heaters.
• Current large-scale graphene production methods are expensive and chemically intensive.
• Laser-induced graphene (LIG) presents a novel, single-step, chemical-free fabrication technique.

Purpose of the Study:

• To demonstrate the fabrication of patterned LIG-based flexible heaters.
• To investigate the heating response of LIG heaters to radio frequency (RF) electromagnetic waves.
• To evaluate the performance and stability of LIG flexible heaters.

Main Methods:

• Fabrication of patterned LIG on polymeric substrates using laser ablation in raster and vector modes.
• Testing the heating response of LIG heaters under various RF electromagnetic field conditions.
• Materials characterization to analyze graphene morphology and performance.

Main Results:

• LIG heaters achieved a maximum steady-state temperature of approximately 500 °C.
• Exceptional heating rates of up to 502 °C/s were observed under specific RF conditions (200 MHz, 4.6 W).
• Heaters fabricated in vector mode exhibited superior performance compared to raster mode, attributed to better RF absorbance.

Conclusions:

• Patterned LIG is a promising material for efficient flexible heater applications.
• LIG heaters show remarkable heating rates and stability, suitable for demanding applications.
• Vector mode laser processing yields higher quality LIG for enhanced RF heating performance.