石油化工高等学校学报2024，Vol.37Issue(3)：1-10,10.DOI:10.12422/j.issn.1006-396X.2024.03.001
基于二噻吩并吡咯的D-A共轭聚合物的合成及热电性能研究
Synthesis and Thermoelectric Properties of Dithieno[3,2-b:2',3'-d]pyrrole-Based D-A Conjugated Polymers
摘要
Abstract
To investigate the effect of donor unit length on the thermoelectric properties of D-A conjugated polymer,three D-A conjugated polymers(PDPP-DTP,PDPP-2DTP,PDPP-3DTP)based on dithieno[3,2-b:2',3'-d]pyrrole(DTP)with different donor unit lengths were designed and synthesized.The influence of donor unit lengths on the energy levels of the polymers was studied by electrochemical characterization and density functional theory calculations.With ferric chloride as dopant,the polymer films were oxidation doped.Their optical and thermoelectric properties as well as the temperature dependent resistance were discussed.The results show that the HOMO energy levels of the polymers gradually increase with the extension of the length of the DTP-like donor unit,which makes them easier to be oxidatively doped.At the same dopant concentration,the doped polymers exhibit higher conductivity with the extension of the donor unit length.Among them,PDPP-3DTP shows the highest electrical conductivity of 302.3 S/cm,which is much higher than that of PDPP-2DTP(106.2 S/cm)and PDPP-DTP(64.7 S/cm).The charge transport energy barrier of the polymer films gradually decreases with the extension of the length of the donor unit,which is beneficial for the enhancement of electrical conductivity of doped films.However,the Seebeck coefficient of the doped polymer film decreases with the extension of the length of the donor unit,and the final polymer PDPP-2DTP is doped and optimized to have the highest thermoelectric power factor of 19.4 μW/(m·K2).关键词
D-A共轭聚合物/热电/二噻吩并吡咯/给体单元长度/掺杂Key words
D-A conjugated polymers/Thermoelectric/Dithieno[3,2-b:2',3'-d]pyrrole/Donor unit length/Doping分类
化学化工引用本文复制引用
林婷,张宇航,李慧,李鹏程..基于二噻吩并吡咯的D-A共轭聚合物的合成及热电性能研究[J].石油化工高等学校学报,2024,37(3):1-10,10.基金项目
国家自然科学基金项目(51903194) （51903194）
湖北省自然科学基金项目(2023AFB781) （2023AFB781）
安徽省绿色高分子材料重点实验室开放基金项目(2023K04). （2023K04）
