Enhanced\nThermoelectric Performance of Conjugated\nPolymer/Single-Walled Carbon Nanotube Composites with Strong Stacking

Abstract

We design and synthesize\na novel donor–acceptor-type BDT-based\nconjugated polymer,PBDT­DTffBT, and prepare composite films containing\nsingle-walled carbon nanotubes (SWCNTs) and the PBDT­DTffBT polymer.\nStrong π–π interfacial interactions are present\nbetween the PBDT­DTffBT polymer and the SWCNTs, and we systematically\nstudy the effects of different mass ratios of PBDT­DTffBT to\nSWCNTs on the thermoelectric (TE) properties. The maximum electrical\nconductivity, Seebeck coefficient, power factor, and ZT value of the\ncomposite films are 529.3 S cm^–1, 68.1 μV\nK^–1, 80.9 μW m^–1 K^–2, and 0.028 at room temperature, respectively. Additionally, the\ncomposite film with a PBDT­DTffBT:SWCNT mass ratio of 1:10 exhibits\nthe highest power factor of 116.7 μW m^–1 K^–2 at approximately 95 °C. This study has a large\npotential to broaden the research scope of composite TE materials.