Enhancing the thermoelectric performance through the mutual interaction between conjugated polyelectrolytes and single-walled carbon nanotubes

doi:10.1088/1674-1056/ac48f9

Abstract We present a method of constructing composites composed of conjugated polyelectrolytes (CPEs) and single-walled carbon nanotubes (SWCNTs) to obtain a high-performing flexible thermoelectric generator. In this approach, three kinds of polymers, namely, poly[(1,4-(2,5-didodecyloxybenzene)-alt-2,5-thiophene] (P1), poly[(1,4-(2,5-bis-sodium butoxysulfonate-phenylene)-alt-2,5-thiophene] (P2), and poly[(1,4-(2,5-bis-acid butoxysulfonic-phenylene)-alt-2,5-thiophene] (P3) are designed, synthesized and complexed with SWCNTs as thermoelectric composites. The electrical conductivities of the CPEs/SWCNTs (P2/SWCNTs, and P3/SWCNTs) nanocomposites are much higher than those of non-CPEs/SWCNTs (P1/SWCNTs) nanocomposites. Among them, the electrical conductivity of P2/SWCNTs with a ratio of 1:4 reaches 3686 S·cm^-1, which is 12.4 times that of P1/SWCNTs at the same SWCNT mass ratio. Moreover, CPEs/SWCNTs composites (P2/SWCNTs) display remarkably improved thermoelectric properties with the highest power factor (PF) of 163 μW·m^-1·K^-2. In addition, a thermoelectric generator is fabricated with P2/SWCNTs composite films, and the output power and power density of this generator reach 1.37 μW and 1.4 W·m^-2 (cross-section) at ΔT=70 K. This result is over three times that of the thermoelectric generator composed of non-CPEs/SWCNTs composite films (P1/SWCNTs, 0.37 μW). The remarkably improved electrical conductivities and thermoelectric properties of the CPEs/SWCNTs composites (P2/SWCNTs) are attributed to the enhanced interaction. This method for constructing CPEs/SWCNTs composites can be applied to produce thermoelectric materials and devices.

Keywords: composites thermoelectric SWCNTs conjugated polyelectrolytes

Received: 31 July 2021
Revised: 02 January 2022
Accepted manuscript online: 07 January 2022

PACS:	81.05.Qk	(Reinforced polymers and polymer-based composites)
	72.15.Jf	(Thermoelectric and thermomagnetic effects)
	81.05.U-	(Carbon/carbon-based materials)
	81.05.Lg	(Polymers and plastics; rubber; synthetic and natural fibers; organometallic and organic materials)

Fund: This work was supported by the National Natural Science Foundation of China (Grant Nos. 51803126 and 21704065) and the Natural Science Foundation of Guangdong Province, China (Grant No. 2018A0303130157). We thank the Instrumental Analysis Centre of Shenzhen University for analytical support.

Corresponding Authors: Chengjun Pan, Lei Wang
E-mail: wl@szu.edu.cn;pancj@szu.edu.cn

Cite this article:

Shuxun Wan(万树勋), Zhongming Chen(陈忠明), Liping Hao(郝丽苹), Shichao Wang(王世超), Benzhang Li(李本章), Xiao Li(黎潇), Chengjun Pan(潘成军), and Lei Wang(王雷) Enhancing the thermoelectric performance through the mutual interaction between conjugated polyelectrolytes and single-walled carbon nanotubes 2022 Chin. Phys. B 31 028104

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Enhancing the thermoelectric performance through the mutual interaction between conjugated polyelectrolytes and single-walled carbon nanotubes

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