Luo Piao, Zhang Kai, Wu Nanjie, Wei Lanlan, Peng Shigui, Fan Qiao, Luo Tingting, Yin Yucheng, Zhang Xiang, Liu Yufei, He Min, Yu Jie, Qin Shuhao
Department of Polymer Material and Engineering, College of Materials and Metallurgy, Guizhou University Guiyang China
National Engineering Research Center for Compounding and Modification of Polymeric Materials Guiyang China.
RSC Adv. 2025 Mar 21;15(11):8719-8728. doi: 10.1039/d5ra00124b. eCollection 2025 Mar 17.
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is a promising conductive polymer material, but its acidic nature leads to device deterioration and poor long-term durability. It is usual practice to neutralise PEDOT:PSS solutions with bases, resulting in a decrease of conductivity. The causes of the decline in conductivity remain disputed and uncertain. In this study, three bases (sodium hydroxide, ammonium hydroxide, and imidazole) were employed to treat PEDOT:PSS to investigate their effects on doping level, composition, and structure. The results show that bases may dedope PEDOT:PSS by removing the proton doping from the PEDOT chain. Meanwhile, insulating PSS is removed, and the aggregated structure is optimised to ensure that conductivity is not significantly reduced. The PEDOT:PSS treated with the weak base imidazole showed the least loss of conductivity due to only a modest decrease in doping level and the greatest loss of insulating PSS. Aluminium electrolytic capacitors made using imidazole pH-adjusted solutions have a capacitance ratio of up to 98.28% and an equivalent series resistance of 26 mΩ. These findings provide a valuable reference for developing high electrical characteristics and neutral PEDOT:PSS materials.
聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT:PSS）是一种很有前景的导电聚合物材料，但其酸性性质会导致器件性能恶化和长期耐久性较差。通常的做法是用碱中和PEDOT:PSS溶液，这会导致电导率降低。电导率下降的原因仍存在争议且尚不明确。在本研究中，使用了三种碱（氢氧化钠、氢氧化铵和咪唑）来处理PEDOT:PSS，以研究它们对掺杂水平、组成和结构的影响。结果表明，碱可能通过从PEDOT链上去除质子掺杂来使PEDOT:PSS去掺杂。同时，绝缘的PSS被去除，并且聚集结构得到优化，以确保电导率不会显著降低。用弱碱咪唑处理的PEDOT:PSS由于掺杂水平仅适度降低且绝缘PSS损失最大，因而电导率损失最小。使用经咪唑调节pH值的溶液制成的铝电解电容器，其电容比高达98.28%，等效串联电阻为26 mΩ。这些发现为开发具有高电性能的中性PEDOT:PSS材料提供了有价值的参考。
