期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 8, 页码 8138-8147出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b00298
关键词
reductant/oxidant; PEDOT:PSS; PEIE; hole block; thermoelectrics
资金
- National Natural Science Foundation of China [51572117, 51762018, 51863009, 51662012, 51762020]
- Innovation Driven 5511 Project of Jiangxi Province [20165BCB18016]
- Natural Science Foundation of Jiangxi Province [20181ACB20010, 20171ACB20026]
- Jiangxi Science & Technology Normal University Innovation Fund of Postgraduates [YC2017-X18]
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology)
The regulation of oxidation levels is of great importance as an efficient way to optimize the thermoelectric (TE) performance of conducting polymers. Many efforts have been devoted to the acquisition of a high TE performance for poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) by oxidation/reduction post treatment to achieve an effective compromise. However, a strong oxidant/reductant is usually employed to tune the TE performance of PEDOT:PSS with high electrical conductivity (sigma) and Seebeck coefficient (S), and it also presents a number of operational challenges depending on a fast reaction rate. Herein, nontoxic polyethylenimine ethoxylated (PEIE) served as a reductant to successfully realize an enhanced S for PEDOT:PSS, besides playing a significant anion-blocking role in enabling the efficient modulation of the oxidation level by sulfuric acid (H2SO4) with a longer operating time. Eventually, a good PEDOT-rich nanocrystal is achieved by a sequential dipping process in PEIE/ethylene glycol and H2SO4 solutions. The large TE power factor of 133 mu W m(-1) K-2 can be ascribed to the good formation of PEDOT-rich nanocrystals and an effective compromise between a and S of PEDOT:PSS films. A mechanism was elucidated for the efficient regulation of sigma and S enabling high performance of organic TE materials.
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