Gu Modi, Travaglini Lorenzo, Ta Daniel, Hopkins Jonathan, Lauto Antonio, Wagner Pawel, Wagner Klaudia, Officer David L, Mawad Damia
School of Materials Science and Engineering, UNSW Sydney, Sydney, New South Wales 2052, Australia.
School of Science, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia.
Mater Horiz. 2024 Sep 30;11(19):4809-4818. doi: 10.1039/d4mh00654b.
Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) remains the most investigated conjugated polymer in bioelectronics, due to its biocompatibility, high conductivity, and commercial availability. Despite these advantages, it suffers from structural and electronic instability, associated with the PSS component. Here, a graft copolymer based on ionised sulfonic modified PEDOT, poly(EDOTS--EDOT), was electrochemically synthesised with demonstrated structural and electronic stability and enhanced electrochemical performance. The graft copolymer was insoluble in water without crosslinking, and exhibited enhanced ion diffusion upon electrochemical switching, as revealed by its volumetric capacitance (159 ± 8 F cm), which was significantly higher than that of spin-coated PEDOT:PSS films (41 ± 5 F cm). Similarly, its performance as an active channel material in organic electrochemical transistors (OECTs) was superior to the spin-coated PEDOT:PSS, as shown for instance by its high normalised transconductance (273 ± 79 S cm) and a significantly high / ratio (19 345 ± 1205). Its short- and long-term electronic stability were also confirmed with no drop in its output drain current, despite its high swelling degree. In contrast, the spin-coated PEDOT:PSS experienced a significant deterioration in its performance over the same operational time. The facile synthesis and improved performance of poly(EDOTS--EDOT) highlight the importance of innovative material design in overcoming existing operational shortcomings in electronic devices.
聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT:PSS）由于其生物相容性、高导电性和商业可得性，仍然是生物电子学中研究最多的共轭聚合物。尽管具有这些优点，但它因与PSS组分相关的结构和电子不稳定性而受到影响。在此，基于离子化磺酸改性PEDOT的接枝共聚物聚（EDOTS- -EDOT）通过电化学合成得到，具有已证明的结构和电子稳定性以及增强的电化学性能。该接枝共聚物在不交联的情况下不溶于水，并且在电化学切换时表现出增强的离子扩散，其体积电容（159±8 F/cm）表明了这一点，该值显著高于旋涂PEDOT:PSS薄膜的体积电容（41±5 F/cm）。同样，它作为有机电化学晶体管（OECT）中活性沟道材料的性能优于旋涂PEDOT:PSS，例如通过其高归一化跨导（273±79 S/cm）和显著高的/比（19345±1205）可以看出。尽管其溶胀度高，但其短期和长期电子稳定性也得到了证实，其输出漏极电流没有下降。相比之下，在相同的运行时间内，旋涂PEDOT:PSS的性能出现了显著恶化。聚（EDOTS- -EDOT）的简便合成和改进性能突出了创新材料设计在克服电子器件现有运行缺点方面的重要性。
