▎ 摘　　要

This study investigated ultraviolet-laser-induced graphene (ULIG) through the far-infrared irradiation (FIR) of polyimide films for constructing flexible electric heaters. Graphene, which has a uniform micro-scale porous structure with high electrical conductivity, was formed along the laser-induced paths through photothermal and photochemical reactions. Raman spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were used to measure the microstructure, elemental composition, and chemical states of the ULIG films and thereby investigate their graphenization and defect level. Moreover, the surface morphology and electrical properties of the ULIG films were evaluated using a field-emission scanning electron microscope and source measurement unit, respectively. Finally, optimal processing parameters, namely a surface laser fluence of 48 J/cm(2), a pulse repetition rate of 100 kHz, and a scan pitch of 0.01 mm, were used to fabricate ULIG heaters with triangular and honeycomb electrode structures. The ULIG films with FIR exhibited a high-quality and high-integrity porous structure, a low electrical resistance of 2.55 omega, and a low sheet resistance of 14.34 +/- 2.04 omega/sq. Furthermore, the ULIG heaters exhibited ultrafast heating and cooling rates (90.93 and 89.37 celcius/s, respectively) as well as excellent heating stability and flexibility.