Fatkullin Maxim, Petrov Ilia, Dogadina Elizaveta, Kogolev Dmitry, Vorobiev Alexandr, Postnikov Pavel, Chen Jin-Ju, de Oliveira Rafael Furlan, Kanoun Olfa, Rodriguez Raul D, Sheremet Evgeniya
Research School of Chemical and Biomedical Technologies, Tomsk Polytechnic University, Lenin Ave. 30, 634050 Tomsk, Russia.
School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China.
Polymers (Basel). 2025 Jan 14;17(2):192. doi: 10.3390/polym17020192.
Laser reduction of graphene oxide (GO) is a promising approach for achieving flexible, robust, and electrically conductive graphene/polymer composites. Resulting composite materials show significant technological potential for energy storage, sensing, and bioelectronics. However, in the case of insulating polymers, the properties of electrodes show severely limited performance. To overcome these challenges, we report on a post-processing redox treatment that allows the tuning of the electrochemical properties of laser-induced rGO/polymer composite electrodes. We show that the polymer substrate plays a crucial role in the electrochemical modulation of the composites' properties, such as the electrode impedance, charge transfer resistance, and areal capacitance. The mechanism behind the reversible control of electrochemical properties of the rGO/polymer composites is the cleavage of polymer chains in the vicinity of rGO flakes during redox cycling, which exposes rGO active sites to interact with the electrolyte. Sequential redox cycling improves composite performance, allowing the development of devices such as electrolyte-gated transistors, which are widely used in chemical sensing applications. Our strategy enables the engineering of the electrochemical properties of rGO/polymer composites by post-treatment with dynamic switching, opening up new possibilities for flexible electronics and electrochemical applications having tunable properties.
激光还原氧化石墨烯（GO）是制备柔性、坚固且导电的石墨烯/聚合物复合材料的一种很有前景的方法。所得复合材料在能量存储、传感和生物电子学方面显示出巨大的技术潜力。然而，对于绝缘聚合物而言，电极的性能表现出严重受限。为了克服这些挑战，我们报道了一种后处理氧化还原处理方法，该方法能够调节激光诱导的还原氧化石墨烯（rGO）/聚合物复合电极的电化学性能。我们表明，聚合物基底在复合材料性能的电化学调制中起着关键作用，例如电极阻抗、电荷转移电阻和面积电容。rGO/聚合物复合材料电化学性能可逆控制背后的机制是在氧化还原循环过程中，rGO薄片附近的聚合物链发生断裂，从而使rGO活性位点暴露出来与电解质相互作用。连续的氧化还原循环可改善复合材料性能，有助于开发诸如电解质门控晶体管等器件，这些器件广泛应用于化学传感领域。我们的策略通过动态切换后处理实现了对rGO/聚合物复合材料电化学性能的调控，为具有可调性能的柔性电子学和电化学应用开辟了新的可能性。
