Optimization of Wet-Spun PEDOT:PSS Fibers for Thermoelectric Applications Through Innovative Triple Post-treatments  

作　　者：Yu-Yu Deng Xiao-Lei Shi Ting Wu Yicheng Yue Wei-Di Liu Meng Li Fang Yue Pei Huang Qingfeng Liu Zhi-Gang Chen 

机构地区：[1]State Key Laboratory of Materials Oriented Chemistry Engineering,College of Chemistry Engineering,Nanjing Tech University,Nanjing 211816,Jiangsu,People’s Republic of China [2]School of Chemistry and Physics,ARC Research Hub in Zero-Emission Power Generation for Carbon Neutrality,and Centre for Materials Science,Queensland University of Technology,Brisbane,QLD 4000,Australia [3]Merino&Co Ltd,Osborne Park,Perth,WA 6017,Australia

出　　处：《Advanced Fiber Materials》2024年第5期1616-1628,共13页先进纤维材料（英文）

基　　金：supported by the National Natural Science Foundation of China(No.52272040);the State Key Laboratory of Materials-Oriented Chemical Engineering Program(SKL-MCE-23A04);the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD);the Jiangsu Specially-Appointed Professor Program.

摘　　要：Owing to the high flexibility,low thermal conductivity,and tunable electrical transport property,poly(3,4-ethylenedioxythi ophene):poly(styrenesulfonate)(PEDOT:PSS)exhibits promising potential for designing flexible thermoelectric devices in the form of films or fibers.However,the low Seebeck coefficient and power factor of PEDOT:PSS have restricted its practical applications.Here,we sequentially employ triple post-treatments with concentrated sulfuric acid(H_(2)SO_(4)),sodium borohy-dride(NaBH_(4)),and 1-ethyl-3-methylimidazolium dichloroacetate(EMIM:DCA)to enhance the thermoelectric performance of flexible PEDOT:PSS fibers with a high power factor of(55.4±1.8)μW m^(-1) K^(-2) at 25°C.Comprehensive characteriza-tions confirm that excess insulating PSS can be selectively removed after H_(2)SO_(4)and EMIM:DCA treatments,which induces conformational changes to increase charge carrier mobility,leading to enhanced electrical conductivity.Simultaneously,NaBH_(4) treatment is employed to adjust the oxidation level,further optimizing the Seebeck coefficient.Additionally,the assembled flexible fiber thermoelectric devices show an output power density of(60.18±2.79)nW cm^(-2)at a temperature difference of 10 K,proving the superior performance and usability of the optimized fibers.This work provides insights into developing high-performance organic thermoelectric materials by modulating polymer chains.

关 键 词：THERMOELECTRIC PEDOT:PSS Fiber Wet spin POST-TREATMENT 

分 类 号：TB34[一般工业技术—材料科学与工程]