Increasing the thermoelectric power generated by composite films using chemically functionalized single-walled carbon nanotubes

Mingxing Piao, Junhong Na, Jaewan Choi, Jaesung Kim, Gary P. Kennedy, Gyu-Tae Kim, Siegmar Roth, Urszula Dettlaff-Weglikowska

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

We prepared and characterized flexible thermoelectric (TE) materials based on thin films of single-walled carbon nanotube (SWCNT) composites with polyvinylalcohol. While pristine SWCNTs incorporated in a polymer matrix generated a p-type TE material, chemical functionalization of SWCNTs by using polyethyleneimine produced an n-type TE material. TE modules made of both p- and n-type composite were fabricated to demonstrate TE voltage and power generation. A single p-n junction made of two composite strips containing 20 wt.% of SWCNTs generated a high TE voltage of 92 μV per 1 K temperature gradient (ΔT). By combining five electrically connected p-n junctions an output voltage of 25 mV was obtained upon the applying ΔT = 50 K. Furthermore, this module generated a power of 4.5 nW when a load resistance matched the internal module resistance of 30 kΩ. These promising results show the potential of TE energy conversion provided by the SWCNT composite films connected in scalable modules for applications that require light weight and mechanical flexibility.

Original languageEnglish
Pages (from-to)430-437
Number of pages8
JournalCarbon
Volume62
DOIs
Publication statusPublished - 2013 Oct 1

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Thermoelectric power
Composite films
Single-walled carbon nanotubes (SWCN)
Composite materials
Thermoelectric energy conversion
Electric potential
Polyethyleneimine
Polymer matrix
Thermal gradients
Power generation
Thin films

ASJC Scopus subject areas

  • Chemistry(all)

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Increasing the thermoelectric power generated by composite films using chemically functionalized single-walled carbon nanotubes. / Piao, Mingxing; Na, Junhong; Choi, Jaewan; Kim, Jaesung; Kennedy, Gary P.; Kim, Gyu-Tae; Roth, Siegmar; Dettlaff-Weglikowska, Urszula.

In: Carbon, Vol. 62, 01.10.2013, p. 430-437.

Research output: Contribution to journalArticle

Piao, Mingxing ; Na, Junhong ; Choi, Jaewan ; Kim, Jaesung ; Kennedy, Gary P. ; Kim, Gyu-Tae ; Roth, Siegmar ; Dettlaff-Weglikowska, Urszula. / Increasing the thermoelectric power generated by composite films using chemically functionalized single-walled carbon nanotubes. In: Carbon. 2013 ; Vol. 62. pp. 430-437.
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