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Environment-Friendly Post-Treatment of PEDOT-Tos Films by Aqueous Vitamin C Solutions for Tuning of Thermoelectric Properties

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Abstract

Aqueous vitamin C solution has been used as an environment-friendly reducing agent for tuning the thermoelectric properties of p-toluenesulfonate-doped poly(3,4-ethylenedioxythiophene) (PEDOT-Tos) films. The de-doping of the PEDOT-Tos films by aqueous vitamin C solutions led to a decrease in the electrical conductivity of the films. The measured ultraviolet-visible-near-infrared and x-ray photoelectron spectra clearly indicated the reduction in the oxidation level from 37 to 23% when the PEDOT-Tos films were treated with 5% (w/v) aqueous vitamin C solutions. An increase in the Seebeck coefficient was measured, resulting in an increase in the figure-of-merit (ZT). A 42% increase in ZT was determined for the 5% aqueous vitamin C solution-treated PEDOT-Tos films with respect to that of the untreated films.

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Authors and Affiliations

  1. Department of Chemistry, University of Massachusetts Lowell, Lowell, MA, 01854, USA

    Ezaz Hasan Khan & Yiwen Wang

  2. Center for Advanced Materials, University of Massachusetts Lowell, Lowell, MA, 01854, USA

    Sammaiah Thota, Lian Li & Jayant Kumar

  3. Department of Physics, University of Massachusetts Lowell, Lowell, MA, 01854, USA

    Jayant Kumar

  4. US Army Natick Soldier Research, Development and Engineering Center, Natick, MA, 01760, USA

    Lian Li, Eugene Wilusz & Richard Osgood

Authors
  1. Ezaz Hasan Khan
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  2. Sammaiah Thota
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  3. Yiwen Wang
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  4. Lian Li
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  5. Eugene Wilusz
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  6. Richard Osgood
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  7. Jayant Kumar
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Correspondence to Jayant Kumar.

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Khan, E.H., Thota, S., Wang, Y. et al. Environment-Friendly Post-Treatment of PEDOT-Tos Films by Aqueous Vitamin C Solutions for Tuning of Thermoelectric Properties. J. Electron. Mater. 47, 3963–3968 (2018). https://doi.org/10.1007/s11664-018-6279-5

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  • DOI: https://doi.org/10.1007/s11664-018-6279-5

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