Significant improvement in the thermoelectric properties of zwitterionic polysquaraine composite films

Mei Chan Ho, Ching Hsun Chao, An Ya Lo*, Chun-Hua Chen, Ren Jye Wu, Mei Hui Tsai, Yi Chia Huang, Wha Tzong Whang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


In this study, the polysquaraine SQI 0.1 , a zwitterionic π-conjugated polymer, was adopted as the matrix for the preparation of flexible and freestanding films; the low band gap of this semiconducting polymer made it a natural choice for use as a thermoelectric (TE) polymer. To enhance their TE applications, both single-walled carbon nanotubes (SWNTs) and mesoporous carbon (i.e., CMK-3) were integrated into the SQI 0.1 -based films and the effects of doping with iodine were also investigated. Using scanning electron microscopy, the variations in morphology of these SQI 0.1 -based films were examined. Raman spectroscopy was used to study the π-π interactions between iodine and the carbon materials (i.e., SWNT, CMK-3); X-ray diffraction and Raman spectroscopy to investigate the intercalation of the doped iodine in the composite films; and X-ray photoelectron spectroscopy to determine the valence state of the doped iodine. The TE properties of these materials were characterized in terms of the electrical conductivity (σ), thermal conductivity (κ), and Seebeck coefficient (S). The TE properties of the iodine-doped composite film prepared from SWNTs, CMK-3, and SQI 0.1 included a notable value of ZT (Figure of Merit) of 4.563 × 10 -3 , which was 143% of that of the corresponding iodine-doped SQI 0.1 film.

Original languageEnglish
Pages (from-to)920-928
Number of pages9
JournalMaterials Chemistry and Physics
Issue number2-3
StatePublished - 16 Sep 2013


  • Composite materials
  • Electrical conductivity
  • Polymer
  • Thermoelectric effects

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