Du Fei-Peng, Cao Nan-Nan, Zhang Yun-Fei, Fu Ping, Wu Yan-Guang, Lin Zhi-Dong, Shi Run, Amini Abbas, Cheng Chun
School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430074, China.
Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
Sci Rep. 2018 Apr 24;8(1):6441. doi: 10.1038/s41598-018-24632-4.
The typical conductive polymer of PEDOT:PSS has recently attracted intensive attention in thermoelectric conversion because of its low cost and low thermal conductivity as well as high electrical conductivity. However, compared to inorganic counterparts, the relatively poor thermoelectric performance of PEDOT:PSS has greatly limited its development and high-tech applications. Here, we report a dramatic enhancement in the thermoelectric performance of PEDOT:PSS by constructing unique composite films with graphene quantum dots (GQDs). At room temperature, the electrical conductivity and Seebeck coefficient of PEDOT:PSS/GQDs reached to 7172 S/m and 14.6 μV/K, respectively, which are 30.99% and 113.2% higher than those of pristine PEDOT:PSS. As a result, the power factor of the optimized PEDOT:PSS/GQDs composite is 550% higher than that of pristine PEDOT:PSS. These significant improvements are attributed to the ordered alignment of PEDOT chains on the surface of GQDs, originated from the strong interfacial interaction between PEDOT:PSS and GQDs and the separation of PEDOT and PSS phases. This study evidently provides a promising route for PEDOT:PSS applied in high-efficiency thermoelectric conversion.
典型的聚（3,4-乙撑二氧噻吩）：聚苯乙烯磺酸盐（PEDOT:PSS）导电聚合物因其低成本、低导热率以及高电导率，近年来在热电转换领域引起了广泛关注。然而，与无机材料相比，PEDOT:PSS相对较差的热电性能极大地限制了其发展和高科技应用。在此，我们报告通过构建具有石墨烯量子点（GQDs）的独特复合薄膜，PEDOT:PSS的热电性能得到了显著增强。在室温下，PEDOT:PSS/GQDs的电导率和塞贝克系数分别达到7172 S/m和14.6 μV/K，比原始PEDOT:PSS分别高出30.99%和113.2%。因此，优化后的PEDOT:PSS/GQDs复合材料的功率因子比原始PEDOT:PSS高550%。这些显著的改进归因于PEDOT链在GQDs表面的有序排列，这源于PEDOT:PSS与GQDs之间的强界面相互作用以及PEDOT和PSS相的分离。这项研究显然为PEDOT:PSS应用于高效热电转换提供了一条有前景的途径。
