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A5: Nanoscale and low dimensional effects

Preparation and Thermoelectric Properties of PEDOT-block-PEG/SWCNTs composites

Haijun Song, Danhua Zhu, Congcong Liu, Jingkun Xu*, Hui Shi, Qinglin Jiang, Zhengyou Zhu
JiangxiKey Laboratory of Organic Chemistry,JiangxiScience andTechnologyNormalUniversity,Nanchang330013

Single-walled carbon nanotubes (SWCNTs) were incorporated with poly(3,4-ethylenedioxythiophene) - block - poly(ethylene glycol) solution (PEDOT-block-PEG) for preparing conducting polymer-based thermoelectric material films by a physical mixing method. Scanning electron microscopy was used to analyze the microstructure of the conductive network composite films. The maximum electrical conductivity of the composite could reach up to 78.6 S/cm, showing a dramatic improvement as compared with pure PEDOT-block-PEG (0.51 S/cm at 300 K). The Seebeck coefficient of the composite has been enhanced from 5.2 μV/K to 42 μV/K. When the content of SWCNTs is 66.7 wt%, the maximum power factor was 13.9 μW/mK2, about 3 orders of magnitude higher than that of pure PEDOT-block-PEG. This study suggests that constructing conducting polymer/CNTs nanocomposite might be an effective way for improving the thermoelectric properties of conducting polymers.