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ACS Appl Mater Interfaces. 2017 Feb 22;9(7):6306-6313. doi: 10.1021/acsami.6b15327. Epub 2017 Feb 9.

High Thermoelectric Power Factor Organic Thin Films through Combination of Nanotube Multilayer Assembly and Electrochemical Polymerization.

Author information

1
Molecular Science Institute, University of Valencia , PO Box 22085, 46071 Valencia, Spain.
2
Materials Science Institute, University of Valencia , Dr. Moliner 50, 46100 Burjasot, Spain.

Abstract

In an effort to produce effective thermoelectric nanocomposites with multiwalled carbon nanotubes (MWCNT), layer-by-layer assembly was combined with electrochemical polymerization to create synergy that would produce a high power factor. Nanolayers of MWCNT stabilized with poly(diallyldimethylammonium chloride) or sodium deoxycholate were alternately deposited from water. Poly(3,4-ethylene dioxythiophene) [PEDOT] was then synthesized electrochemically by using this MWCNT-based multilayer thin film as the working electrode. Microscopic images show a homogeneous distribution of PEDOT around the MWCNT. The electrical resistance, conductivity (σ) and Seebeck coefficient (S) were measured before and after the PEDOT polymerization. A 30 bilayer MWCNT film (<1 μm thick) infused with PEDOT is shown to achieve a power factor (PF = S2σ) of 155 μW/m K2, which is the highest value ever reported for a completely organic MWCNT-based material and competitive with lead telluride at room temperature. The ability of this MWCNT-PEDOT film to generate power was demonstrated with a cylindrical thermoelectric generator that produced 5.5 μW with a 30 K temperature differential. This unique nanocomposite, prepared from water with relatively inexpensive ingredients, should open up new opportunities to recycle waste heat in portable/wearable electronics and other applications where low weight and mechanical flexibility are needed.

KEYWORDS:

carbon nanotubes; electrochemical polymerization; layer-by-layer assembly; polymer nanocomposites; power factor; thermoelectric

PMID:
28128932
DOI:
10.1021/acsami.6b15327

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