journal article·2022-06-22

Anion Size Effect of Ionic Liquids in Tuning the Thermoelectric and Mechanical Properties of PEDOT:PSS Films through a Counterion Exchange Strategy

Qikai Li, Qing Zhou, Wangping Xu, Long Wen, Jun Li, Biao Deng, Jiajia Zhang, Hu Xu, Weishu Liu

ACS Applied Materials & Interfaces· Volume 14· Issue 24
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Abstract

Poly(3,4-ethylene dioxythiophene):poly(styrenesulfonic acid) (PEDOT:PSS) thermoelectric thin films have attracted significant interest due to their solution-processable manufacturing. However, molecular-level tuning or doping is still a challenge to synergistically boost their thermoelectric performance and mechanically stretchable capabilities. In this work, we report a counterion exchange between ionic liquid bis(x-fluorosulfonyl) amide lithium (Li:nFSI, n = 1, 3, 5) with different sizes of anions and a PEDOT:PSS-induced bipolaron network, which significantly boosted the thermoelectric power factor from 0.8 to 157 μW m K–2 at 235 °C and the maximum tensile strain from 3% to over 30%. The π–π* stacking of the PEDOT polymer chains was fine-tuned by the hydrophobic anions of nFSI–, providing a technical route for constructing a bipolaron network and inducing the transition from hopping transport to band-like transport. Furthermore, we found that the stretchable capabilities, that is, εmax, were connected to the gelation time of the PEDOT:PSS-Li:nFSI aqueous solution. Thus, more fluorine-containing groups resulted in longer gelation times and higher εmax values, which significantly improved the processability of the solution-derived films.
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Research context

OpenAlex topics: Advanced Thermoelectric Materials and Devices · Advanced Sensor and Energy Harvesting Materials · Conducting polymers and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, Guangdong, China

Shenzhen Engineering Research Center for Novel Electronic Information Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, China

Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong 999077, China

School of Science, Minzu University of China, Beijing 100081, China

Department of Physics, Guangdong Provincial Key Laboratory of Computational Science and Material Design, and Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, China

Hunan Institute of Advanced Sensing and Information Technology, Xiangtan University, Xiangtan 411105, Hunan, China

Funding

Administration of Ocean and Fisheries of Guangdong Province · Massachusetts Institute of Technology · Tencent · Development and Reform Commission of Shenzhen Municipality · Southern University of Science and Technology · Shenzhen Sci-Tech Fund

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