Thermoelectric properties of composite films from multi-walled carbon nanotubes and ethyl cellulose doped with heteroatoms

•Tuning thermoelectric performance of multi-walled CNTs by doping their with heteroatoms of nitrogen, boron or phosphorus.•MWCNTs doped with nitrogen or boron had improved thermoelectric properties by up to three orders of magnitude as compared with the undoped material.•The results show how carbon...

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Bibliographic Details
Published in:Synthetic metals 2019-11, Vol.257, p.116190, Article 116190
Main Authors: Kumanek, B., Stando, G., Wróbel, P.S., Krzywiecki, M., Janas, D.
Format: Article
Language:English
Subjects:
Boron
Carbon
Carbon nanotubes synthesis
Charge transport
Electrons
Ethyl cellulose
Multi wall carbon nanotubes
Seebeck coefficient
Thermoelectric materials
Thermoelectrics
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Summary:•Tuning thermoelectric performance of multi-walled CNTs by doping their with heteroatoms of nitrogen, boron or phosphorus.•MWCNTs doped with nitrogen or boron had improved thermoelectric properties by up to three orders of magnitude as compared with the undoped material.•The results show how carbon nanotubes should be modyfied to reach the highest thermoelectric performance. Carbon nanotubes (CNTs) have recently emerged as one of the most promising structures for thermoelectrics (TE). As compared with typical thermoelectric materials, CNTs can be made from almost any carbon-bearing precursor, and so at present thousands of tonnes of them are produced annually at every corner of the world. In this work, we synthesized multi-walled CNTs (MWCNTs) and doped them with heteroatoms of nitrogen, boron or phosphorus to tune their thermoelectric performance. The research showed that MWCNTs doped with nitrogen or boron had improved thermoelectric properties by up to three orders of magnitude as compared with the undoped material. Because of the different modes of charge transport by electrons and holes, respectively, they could be used to construct functional thermoelectric modules.
ISSN:0379-6779
1879-3290
DOI:10.1016/j.synthmet.2019.116190