Carbon Nanotube-Based Thermoelectric Modules Enhanced by ZnO Nanowires

Patrycja Taborowska, Tomasz Wasiak, Mika Sahlman, Mari Lundström, Dawid Janas*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Carbon nanotubes (CNTs) have a wide range of unique properties, which have kept them at the forefront of research in recent decades. Due to their electrical and thermal characteristics, they are often evaluated as key components of thermogenerators. One can create thermogenerators exclusively from CNTs, without any metal counterpart, by properly selecting dopants to obtain n-and p-doped CNTs. However, the performance of CNT thermogenerators remains insufficient to reach wide commercial implementation. This study shows that molecular doping and the inclusion of ZnO nanowires (NWs) can greatly increase their application potential. Moreover, prototype modules, based on single-walled CNTs (SWCNTs), ZnO NWs, polyethyleneimine, and triazole, reveal notable capabilities for generating electrical energy, while ensuring fully scalable performance. Upon doping and the addition of ZnO nanowires, the electrical conductivity of pure SWCNTs (211 S/cm) was increased by a factor of three. Moreover, the proposed strategy enhanced the Power Factor values from 18.99 (unmodified SWCNTs) to 34.9 and 42.91 µW/m·K2 for CNTs triazole and polyethyleneimine + ZnO NWs inclusion, respectively.

Original languageEnglish
Article number1924
Number of pages12
JournalMaterials
Volume15
Issue number5
DOIs
Publication statusPublished - 1 Mar 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • Carbon nanotubes
  • Thermoelectric properties
  • ZnO nanowires

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