Flexible and robust laser-induced graphene heaters photothermally scribed on bare polyimide substrates
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AuthorBobinger, Marco; Romero Maldonado, Francisco Javier; Salinas Castillo, Alfonso; Becherer, Markus; Lugli, Paolo; Morales Santos, Diego Pedro; Rodríguez Santiago, Noel; Rivadeneyra Torres, Almudena
CNC laserFlexibleGraphene film heaterLaser-induced grapheneLaser ablationMicro-hotplatePolyimide
We demonstrate the feasibility of fabricating cost-effective and robust laser-induced graphene (LIG) flexible heaters with an innovative technique based on the photothermal production of graphene with a foam-like morphology. The produced devices are precisely defined on a bare polyimide substrate without the need of photomasks by employing a computer numerical control (CNC) driven laser diode. The electrical properties of the LIG-based heaters can be tailored by adjusting the laser power. The resulting conductive material exhibits electrical and chemical properties which are similar to the ones for graphene such as a negative temperature coefficient of −0.46 m°C−1 and a maximum operating temperature of around 400 °C. The developed heaters can outperform the existing emerging technologies showing a very rapid and stable response up to 225 °C with the extra features of flexibility, biocompatibility, and environmental friendliness.