Chen Xiaogang, Chen Shihong, Wang Dagang, Qiu Yongfu, Chen Zhongming, Yang Haixin, Yang Qing, Yin Zijian, Pan Chengjun
College of Chemistry and Chemical Engineering, Shenzhen University, Shenzhen 518060, China.
School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China.
Polymers (Basel). 2024 Aug 29;16(17):2444. doi: 10.3390/polym16172444.
In the development of wearable electronic devices, the composite modification of conductive polymers and single-walled carbon nanotubes (SWCNTs) has become a burgeoning research area. This study presents the synthesis of a novel polythiophene derivative, poly(3-alkoxythiophene) (P3(TEG)T), with alkoxy side chains. Different molecular weight variants of P3(TEG)T (P1-P4) were prepared and combined with SWCNTs to form composite materials. Density functional theory (DFT) calculations revealed a reduced bandgap for P3(TEG)T. Raman spectroscopy demonstrated π-π interactions between P3(TEG)T and SWCNTs, facilitating the dispersion of single-walled carbon nanotubes and the formation of a continuous conductive network. Among the composite films, P4/SWCNTs-0.9 exhibited the highest thermoelectric performance, with a power factor (PF) value of 449.50 μW m K. The fabricated flexible thermoelectric device achieved an output power of 3976.92 nW at 50 K, with a tensile strength of 59.34 MPa for P4/SWCNTs. Our findings highlight the strong interfacial interactions between P3(TEG)T and SWCNTs in the composite material, providing an effective charge transfer pathway. Furthermore, an improvement in the tensile performance was observed with an increase in the molecular weight of the polymer used in the composite, offering a viable platform for the development of high-performance flexible organic thermoelectric materials.
在可穿戴电子设备的发展过程中，导电聚合物与单壁碳纳米管（SWCNTs）的复合改性已成为一个新兴的研究领域。本研究介绍了一种带有烷氧基侧链的新型聚噻吩衍生物聚（3 - 烷氧基噻吩）（P3(TEG)T）的合成。制备了不同分子量变体的P3(TEG)T（P1 - P4），并将其与SWCNTs结合形成复合材料。密度泛函理论（DFT）计算表明P3(TEG)T的带隙减小。拉曼光谱证明了P3(TEG)T与SWCNTs之间存在π - π相互作用，这有利于单壁碳纳米管的分散以及连续导电网络的形成。在复合薄膜中，P4/SWCNTs - 0.9表现出最高的热电性能，功率因子（PF）值为449.50 μW m K。所制备的柔性热电器件在50 K时实现了3976.92 nW的输出功率，P4/SWCNTs的拉伸强度为59.34 MPa。我们的研究结果突出了复合材料中P3(TEG)T与SWCNTs之间强烈的界面相互作用，提供了有效的电荷转移途径。此外，随着复合材料中所用聚合物分子量的增加，观察到拉伸性能有所改善，为高性能柔性有机热电材料的开发提供了一个可行的平台。
