Solvent‐Mediated n‐Type Doping of SWCNTs to Achieve Superior Thermoelectric Power Factor,Advanced Materials Technologies

当前位置： X-MOL 学术 › Adv. Mater. Technol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Solvent‐Mediated n‐Type Doping of SWCNTs to Achieve Superior Thermoelectric Power Factor
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2020-07-23 , DOI: 10.1002/admt.202000288
Ruisi Chen ₁ , Junhui Tang ₁ , Yajie Yan ₁ , Ziqi Liang ₁

Affiliation

Carbon nanotubes (CNTs) have been demonstrated as promising candidates for thermoelectrics (TEs) owing to their excellent electrical and mechanical properties. Here a new dopant to obtain flexible n‐type CNT‐based TE films from solution is reported. By doping single‐walled carbon nanotubes (SWCNTs) with tetrabutylammonium bromide (TBAB), p‐type nanotubes can be successfully converted to n‐type form, which is confirmed by both Raman and X‐ray photoemission spectroscopy (XPS) spectra. Furthermore, the influences of doping concentration and dispersion medium on TE properties are investigated. The optimal n‐type SWCNT films fabricated in N,N‐dimethylformamide (DMF) solvent exhibit an impressive power factor of 339 µW m⁻¹ K⁻² and excellent air stability by less than 10% variation of Seebeck coefficient during 192 h at room temperature without encapsulation, both of which are among the hitherto highest reported. This work sheds light on the interaction between TBAB molecules and SWCNTs in different dispersion media and offers a guideline for efficient n‐doping of SWCNT based TE materials.

中文翻译：

SWCNT的溶剂介导的n型掺杂，可实现优异的热电功率因数

碳纳米管（CNT）由于其出色的电气和机械性能，已被证明是热电（TE）的有前途的候选者。此处报道了一种新的掺杂剂，可从溶液中获得基于n型CNT的柔性TE膜。通过用四丁基溴化铵（TBAB）掺杂单壁碳纳米管（SWCNT），p型纳米管可以成功转换为n型形式，这通过拉曼光谱和X射线光电子能谱（XPS）光谱得以证实。此外，研究了掺杂浓度和分散介质对TE性能的影响。在N，N-二甲基甲酰胺（DMF）溶剂中制备的最佳n型SWCNT膜具有令人印象深刻的339 µW m ^-1 K ^-2功率因数以及在没有封装的情况下，在室温下192 h内塞贝克系数的变化小于10％时，具有出色的空气稳定性，这两个都是迄今为止报道的最高值。这项工作揭示了TBAB分子与SWCNT在不同分散介质中的相互作用，并为基于SWCNT的TE材料进行高效n掺杂提供了指导。

更新日期：2020-09-10

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11