내부 연결 그룹이 다른 폴리이미드 상 레이저 유도 그래핀 전극 직접 성장

초록

We present a facile direct-writing heteroatom-doped graphene on molecularlycontrolled polyimides using a continuous-wave CO2 infrared laser scriber. We first synthesizedpolyimide (PI) films with various internal linkages such as phenylene, trifluoromethyl,and sulfone groups by conventional two-step polycondensation of 4,4'-oxydianiline withthree different tetracarboxylic dianhydrides. The development of graphene from each PIfilm surfaces was confirmed by characterizing the heteroatom-doped (N-doped, F-doped,and S-doped) laser-induced graphene (LIG) layers. We found that both laser processingparameters (e.g., laser power and scan speed) and chemical backbones of PIs had a largeinfluence on the formation and quality of the LIG, investigated in terms of the ID/IG and I2DRaman bands, crystalline size, surface composition, and sheet resistance. A small amountof heteroatom-doping derived from the PI backbones might easily control the electricalconductivity of LIG electrode. It is predicted that the LIG developed according to theobtained results can offer new opportunities for the required simple, low-cost, and flexible electronics and sensors.

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