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A Convenient and Highly-Tunable Way to N-Type Carbon Nanotube Thermoelectric Composite Film Using Common Alkylammonium Cationic Surfactant

Abstract

N-type candidates with high performance are a great challenge for organic and organic/inorganic composite thermoelectric (TE) materials. Here, we report a convenient and highly-tunable way to achieve flexible TE films by doping single-walled carbon nanotube (SWCNT) with common alkylammonium cationic surfactant. Using a simple solution mixing procedure, the pristine p-type SWCNT can be effectively changed to n-type form within a short period. The n-type doping mechanism has been discussed by Raman and XPS spectra. The effects of dopant content, dispersion medium as well as alkyl chain length and anion type of the alkylammonium cationic surfactants on the composite TE performance are systematically investigated. The TE performances of both the n-type TE materials and the corresponding device are among the highest so far. The highest power factor at room temperature reaches 185.7 ± 8.5 μW m-1 K-2. Furthermore, the TE device consisting of five couples of the pristine SWCNT (p-type) and the doped SWCNT (n-type) films generates a high open circuit voltage and a large output power of 37.4 mV and 6.7 μW, respectively, at a temperature gradient of 80 K. The present study opens a convenient and highly-tunable avenue to exploit promising n-type TE composites by doping SWCNT with common alkylammonium cationic surfactants.

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Publication details

The article was received on 09 Aug 2018, accepted on 12 Sep 2018 and first published on 13 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA07746K
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    A Convenient and Highly-Tunable Way to N-Type Carbon Nanotube Thermoelectric Composite Film Using Common Alkylammonium Cationic Surfactant

    X. Cheng, X. Wang and G. Chen, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA07746K

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