Feng Linan, Yu Penglu, Liu Chan, Lan Jinle, Lin Yuan-Hua, Yang Xiaoping
State Key Laboratory of Organic-Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, North Third Ring Road 15, Chaoyang District, Beijing 100029, P. R. China.
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Shuangqing Road 30, Haidian District, Beijing 100084, P. R. China.
ACS Appl Mater Interfaces. 2022 May 10. doi: 10.1021/acsami.2c03368.
In this work, ultrahigh-performance single-walled carbon nanotube (SWCNT)/Se nanowire (NW)/poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) ternary thermoelectric (TE) nanocomposite films are successfully designed by rational design of CNT/Se/PEDOT:PSS ternary nanocomposites. The addition of CNTs apparently improves the electrical conductivity of composite films, resulting in a relatively huge growth of the power factor. The PEDOT:PSS interface layers uniformly attach on both sides of the Se NWs and CNTs effectively, forming a tightly interleaving and interconnected three-dimensional network. As a consequence, a maximum power factor of 863.83 μW/(m·K) has been achieved for the sample containing 26 wt % CNTs at 434 K. Ultimately, a flexible TE generator prototype consisting of 5-unit freestanding composite film strips is fabricated using the optimized composite films, which can generate a maximum output power of 206.8 nW at a temperature gradient of 44.7 K. Therefore, the present work has a further potential to be used for the flexible polymer/carbon TE nanocomposite films and devices.
在本工作中，通过对碳纳米管/硒/聚（3,4 - 乙撑二氧噻吩）：聚（4 - 苯乙烯磺酸盐）（PEDOT:PSS）三元纳米复合材料进行合理设计，成功制备了超高性能单壁碳纳米管（SWCNT）/硒纳米线（NW）/聚（3,4 - 乙撑二氧噻吩）：聚（4 - 苯乙烯磺酸盐）（PEDOT:PSS）三元热电（TE）纳米复合薄膜。碳纳米管的加入显著提高了复合薄膜的电导率，导致功率因子有相对大幅的增长。PEDOT:PSS界面层有效地均匀附着在硒纳米线和碳纳米管的两侧，形成紧密交错且相互连接的三维网络。因此，在434 K时，含26 wt%碳纳米管的样品实现了最大功率因子863.83 μW/(m·K)。最终，使用优化后的复合薄膜制备了由5个单元独立复合薄膜条组成的柔性热电发电机原型，在44.7 K的温度梯度下可产生最大输出功率206.8 nW。所以，本工作在柔性聚合物/碳热电纳米复合薄膜及器件的应用方面具有进一步的潜力。
