Journal of Electronic Materials

, Volume 47, Issue 7, pp 3963–3968 | Cite as

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

  • Ezaz Hasan Khan
  • Sammaiah Thota
  • Yiwen Wang
  • Lian Li
  • Eugene Wilusz
  • Richard Osgood
  • Jayant Kumar


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.


Thermoelectric oxidation state tuning PEDOT-Tos vitamin C electrical conductivity Seebeck coefficient 


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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  • Ezaz Hasan Khan
    • 1
  • Sammaiah Thota
    • 2
  • Yiwen Wang
    • 1
  • Lian Li
    • 2
    • 4
  • Eugene Wilusz
    • 4
  • Richard Osgood
    • 4
  • Jayant Kumar
    • 2
    • 3
  1. 1.Department of ChemistryUniversity of Massachusetts LowellLowellUSA
  2. 2.Center for Advanced MaterialsUniversity of Massachusetts LowellLowellUSA
  3. 3.Department of PhysicsUniversity of Massachusetts LowellLowellUSA
  4. 4.US Army Natick Soldier Research, Development and Engineering CenterNatickUSA

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