材料科学
碳纳米管
热电效应
电阻率和电导率
化学工程
电导率
热电材料
溶剂
热电发电机
导电体
扫描电子显微镜
塞贝克系数
二甲基亚砜
兴奋剂
纳米技术
复合材料
光电子学
热导率
有机化学
物理化学
物理
工程类
热力学
化学
电气工程
作者
Yizhuo Wang,Qing Li,Jing Wang,Zhanchao Li,Kuncai Li,Xiaolin Dai,Jiahao Pan,Hong Wang
出处
期刊:Nano Energy
[Elsevier]
日期:2022-03-01
卷期号:93: 106804-106804
被引量:20
标识
DOI:10.1016/j.nanoen.2021.106804
摘要
Developing high performance solution-processable n-type thermoelectric materials is challenging. In this paper, we report that single-walled carbon nanotubes (SWCNTs) prepared in dimethyl sulfoxide (DMSO) (SWCNTs/DMSO) exhibit a high n-type electrical conductivity of 2298 S/cm at room temperature, which is superior to that of previously reported n-type solution-processable SWCNTs. The maximum n-type electrical conductivity was 3490 S/cm at 373 K. The great electrical conductivity results in a high n-type power factor of 195 μW/m-K2 for SWCNTs/DMSO films at 373 K which is larger than most of the n-type solution-processable SWCNTs. The theoretical calculation indicates that the wrapping morphology of the surfactant on SWCNTs is strongly affected by different solvent polarities which lead to different packing densities of the SWCNT films as demonstrated in the scanning electron microscope images, subsequently affecting the n-type doping efficiency and the n-type electrical conductivity. The electrical conductivity affected by the mixed p- and n-type carriers in the film were discussed. A full SWCNT thermoelectric generator has been fabricated to show the heat-to-electricity conversion ability of the materials. This work reveals a potential method to prepare highly conductive n-type SWCNTs by choosing the proper solvent for optimized thermoelectric performance.
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