摘要
聚(3,4-二氧乙撑噻吩):聚苯乙烯磺酸(PEDOT:PSS)由于其商业化、高水溶性、低热导率和高柔性的特点使其在柔性热电薄膜领域中扮演重要角色。然而PEDOT:PSS中的绝缘PSS和高氧化态导电PEDOT导致其电导率和塞贝克系数较低。利用二甲基亚砜(DMSO)进行二次掺杂去除部分绝缘PSS,使导电PEDOT分子链的有序排列,进而优化PEDOT:PSS薄膜的微观结构,同时结合给电子试剂1,8-二氮杂二环[5,4,0]十一碳-7-烯(DBU)进行去掺杂,实现了PEDOT氧化水平的调控。最终PEDOT:PSS柔性热电薄膜的室温功率因子最高可达48.17μW m^(-1)K^(-2)。此外,经过DMSO和DBU化学处理后的PEDOT:PSS薄膜,其变温热电输运行为符合Mott变程跃迁模型,说明其载流子的传输以热激发的无规则运动为主。研究为开发高性能的有机PEDOT:PSS热电材料提供了新思路。
Poly(3,4-ethylenedioxythiophene):polystyrene sulfonic acid(PEDOT:PSS)plays an important role in flexible thermoelectric films due to its commercialization,excellent water solubility,low thermal conductivity and high flexibility.However,the insulating PSS and highly oxidized conductive PEDOT in PEDOT:PSS lead to lower conductivity and Seebeck coefficient.Here,insulating PSS is partially removed by secondary doping with dimethyl sulfoxide,which benefits to arrange conductive PEDOT molecular chains orderly and optimize the microstructure of PEDOT:PSS film.Meanwhile,the dedoping is carried out using the electron donor 1,8-diazabicyclo[5,4,0]undec-7-ene(DBU),which realizes the regulation of oxidation level of PEDOT.Finally,the room temperature power factor of the PEDOT:PSS flexible thermoelectric film is up to 48.17μW/(m·K^(2)).In addition,the temperature-dependent thermoelectric transport behaviour of PEDOT:PSS film treated by DMSO and DBU can be well-matched with the Mott range jump model,indicating the carrier transport of obtained PEDOT:PSS film is dominated by the random motion of heat excitation.This study provides a new idea for the development of high-performance organic PEDOT:PSS thermoelectric materials.
作者
杨长安
徐彭辉
张荔
YANG Changan;XU Penghui;ZHANG Li(School of Material Science and Engineering,Shaanxi University of Science&Technology,Xi’an 710021,China)
出处
《功能材料》
北大核心
2025年第7期7113-7118,7174,共7页
Journal of Functional Materials
基金
陕西省教育厅重点研发计划项目(22JY012)
陕西省轻化工助剂化学与技术协同创新中心开放基金项目(KFKT2022-15)
陕西科技大学博士科研启动基金项目(2017GBJ-03)。
