Jang Jae Gyu, Woo Sun Young, Lee Hwankyu, Lee Eunji, Kim Sung Hyun, Hong Jong-In
Department of Chemistry, Seoul National University, Seoul 08826, Korea.
Department of Chemical Engineering, Dankook University, Yongin 448-701, Korea.
ACS Appl Mater Interfaces. 2020 Nov 18;12(46):51387-51396. doi: 10.1021/acsami.0c13810. Epub 2020 Nov 9.
Single-walled carbon nanotube (SWCNTs-)-small organic molecule hybrid materials are promising candidates for achieving high thermoelectric (TE) performance. In this study, we synthesized rod-coil amphiphilic molecules, that is, tri(ethylene oxide) chain-attached bis(bithiophenyl)-terphenyl derivatives ( and ). Supramolecular functionalization of SWCNTs- with or induced charge-transfer interactions between them. Improved TE properties of the supramolecular hybrids (SWCNTs- and SWCNTs-) are attributed to increased charge-carrier concentration (electrical conductivity), interfacial phonon scattering (thermal conductivity), and energy difference between the transport and Fermi levels ( - ; Seebeck coefficient). SWCNTs- exhibited a ZT of 0.42 × 10 at 300 K, which is 350% larger than that of SWCNTs-. Furthermore, 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (FTCNQ)-doped SWCNTs- showed the highest ZT value of 1.96 × 10 at 300 K among SWCNTs-/small organic molecule hybrids known until now. These results demonstrated that the supramolecular functionalization of SWCNTs- with small organic molecules could be useful for enhancement of TE performance and applications in wearable/flexible thermoelectrics.
单壁碳纳米管（SWCNTs-）-小分子杂化材料是实现高热电（TE）性能的有前途的候选材料。在本研究中，我们合成了棒-线圈两亲分子，即三（环氧乙烷）链连接的双（联噻吩）-三联苯衍生物（和）。用或对SWCNTs-进行超分子功能化，在它们之间诱导电荷转移相互作用。超分子杂化物（SWCNTs-和SWCNTs-）热电性能的改善归因于载流子浓度（电导率）增加、界面声子散射（热导率）以及输运能级和费米能级之间的能量差（-；塞贝克系数）。SWCNTs-在300 K时的ZT值为0.42×10，比SWCNTs-高350%。此外，在目前已知的SWCNTs-/小分子杂化材料中，2,3,5,6-四氟-7,7,8,8-四氰基对苯二醌二甲烷（FTCNQ）掺杂的SWCNTs-在300 K时显示出最高的ZT值1.96×10。这些结果表明，用小分子对SWCNTs-进行超分子功能化可有助于提高热电性能，并应用于可穿戴/柔性热电学领域。
