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Influence of oriented CNT forest on thermoelectric properties of polymer-based materials
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. Department of Functional Nanosystems and High Temperature Materials, NUST MISiS, Moscow.
Department of Functional Nanosystems and High Temperature Materials, NUST MISiS, Moscow.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena.
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2018 (English)In: Article in journal (Refereed) Epub ahead of print
Abstract [en]

Thermoelectric (TE) materials are highly important due to their ability to convert wasted heat energy into electricity. Among the different TE materials, organic-based or polymer-based TE systems are among the most promising due to their sustainability, non-toxicity and good electrical properties. In our research, we have investigated for the first time the application of vertically aligned carbon nanotubes forest (VA-CNTF) as a filler for TE composite; compared to unconnected carbon nanotubes (CNT), which are typically used in polymer/CNT composites, dry pulled VA-CNTF sheets have more ordered structure, which is supposed to improve the TE efficiency of the material. VA-CNTF and short unoriented multiwalled carbon nanotubes (MWCNT) were used as fillers of a polymeric matrix, to prepare TE composites. Various staking configurations were explored by using CNTF. All the samples were examined by scanning electron microscopy (SEM), micro-Raman spectroscopy, and four-point probe electrical measurements; MWCNT-based samples were used as benchmarking systems.

The results revealed a dramatic increase of the Seebeck coefficient up to 46 μV/K for the VA-CNTF-based sample, while the best MWCNTs-based sample (MWCNT concentration 50 wt.%) provided only 21.49, which is roughly the Seebeck coefficient of pure polymer. This research represents the first application of VA-CNTF as a promising material for TE systems and demonstrates that oriented nanoforests and related CNT sheets are a very perspective material for promising developments in the field.

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Elsevier, 2018.
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Experimental physics
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URN: urn:nbn:se:ltu:diva-67179DOI: 10.1016/j.jallcom.2018.01.010OAI: oai:DiVA.org:ltu-67179DiVA: diva2:1171455
Available from: 2018-01-08 Created: 2018-01-08 Last updated: 2018-01-08

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