Improved Alignment of PEDOT:PSS Induced by in-situ Crystallization of "Green" Dimethylsulfone Molecules to Enhance the Polymer Thermoelectric Performance

Date

2019-11-01

Author

Zhu, Qiang
Yıldırım, Erol
Wang, Xizu
Soo, Xiang Yun Debbie
Zheng, Yun
Tan, Teck Leong
Wu, Gang
Yang, Shuo-Wang
Xu, Jianwei

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Dimethylsulfone (DMSO2), a small organic molecule, was observed to induce the alignment of poly(3,4-ethylenedioxythiophene): poly(4-styrenesulfonate) (PEDOT:PSS) via in-situ crystallization in PEDOT:PSS mixture, which was verified by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and atomic force microscopy (AFM). A chemically stable dopant, DMSO2, remarkably raised the electrical conductivity of the PEDOT:PSS film, which was fabricated from pre-mixed solution of PEDOT:PSS and DMSO2, up to 1080 S/cm, and more importantly, such a PEDOT:PSS film showed a long-term humidity stability and it retained near 90% electric conductivity after 60 days, suggesting DMSO2 is promising for an eco-friendly alternative to replace dimethyl sulfoxide (DMSO), ethylene glycol (EG) and various acids dopants that have been widely employed to dope and post-treat PEDOT:PSS. Pairwise interaction energies and free energy of solvation between PEDOT:PSS and DMSO2 were calculated by first-principles and molecular mechanics, respectively, revealing the mechanism of DMSO2 in enhancing the electrical conductivity.

Subject Keywords

Dimethylsulfone, PEDOT, PSS, Thermoelectric, Polymer alignment, Crystallization

URI

https://hdl.handle.net/11511/38851

Journal

FRONTIERS IN CHEMISTRY

DOI

https://doi.org/10.3389/fchem.2019.00783

Collections

Department of Chemistry, Article

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Citation Formats

Q. Zhu et al., “Improved Alignment of PEDOT:PSS Induced by in-situ Crystallization of “Green” Dimethylsulfone Molecules to Enhance the Polymer Thermoelectric Performance,” FRONTIERS IN CHEMISTRY, pp. 0–0, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38851.