Zar Myint May Thu, Hada Masaki, Inoue Hirotaka, Marui Tatsuki, Nishikawa Takeshi, Nishina Yuta, Ichimura Susumu, Umeno Masayoshi, Ko Kyaw Aung Ko, Hayashi Yasuhiko
Graduate School of Natural Science and Technology, Okayama University 3-1-1 Tsushima-naka, Kita Okayama 700-8530 Japan
Nagoya Industries Promotion Corporation 3-4-41 Rokuban, Atsuta Nagoya 456-0058 Japan.
RSC Adv. 2018 Oct 30;8(64):36563-36570. doi: 10.1039/c8ra06094k. eCollection 2018 Oct 26.
As a thermoelectric (TE) material suited to applications for recycling waste-heat into electricity through the Seebeck effect, poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonic acid) (PEDOT:PSS) is of great interest. Our research demonstrates a comprehensive study of different post-treatment methods with nitric acid (HNO) to enhance the thermoelectric properties of PEDOT:PSS. The optimum conditions are obtained when PEDOT:PSS is treated with HNO for 10 min at room temperature followed by passing nitrogen gas (N) with a pressure of 0.2 MPa. Upon this treatment, PEDOT:PSS changes from semiconductor-like behaviour to metal-like behaviour, with a simultaneous enhancement in the electrical conductivity and Seebeck coefficient at elevated temperature, resulting in an increase in the thermoelectric power factor from 0.0818 to 94.3 μW m K at 150 °C. The improvement in the TE properties is ascribed to the combined effects of phase segregation and conformational change of the PEDOT due to the weakened coulombic attraction between PEDOT and PSS chains by nitric acid as well as the pressure of the N gas as a mechanical means.
作为一种适合通过塞贝克效应将废热回收发电应用的热电（TE）材料，聚（3,4-乙撑二氧噻吩）：聚（4-苯乙烯磺酸）（PEDOT:PSS）备受关注。我们的研究展示了对用硝酸（HNO）进行不同后处理方法的全面研究，以提高PEDOT:PSS的热电性能。当PEDOT:PSS在室温下用HNO处理10分钟，然后通入压力为0.2 MPa的氮气（N）时，可获得最佳条件。经过这种处理，PEDOT:PSS从类似半导体的行为转变为类似金属的行为，在高温下电导率和塞贝克系数同时提高，导致在150°C时热电功率因数从0.0818增加到94.3 μW m K。TE性能的改善归因于硝酸使PEDOT和PSS链之间的库仑吸引力减弱以及N气体压力作为一种机械手段导致的PEDOT相分离和构象变化的综合效应。
