Solvent effects on the charge transport behavior in poly(3,4- ethylenedioxythiophene) synthesized with iron(III)-p-toluenesulfonate

Mo Park Chang, Young Kim Tae, Jung Kim Won, Sang Kim Yun, Kwang Suck Suh

Research output: Contribution to journalArticle

Abstract

The effects of organic solvent on the charge transport behavior of poly(3,4-ethylenedioxythiophene)/p-toluenesulfonate(PEDOT-OTs) are investigated. The use of different organic solvents during the oxidative chemical polymerization of 3,4-ethylenedioxythiophene(EDOT) with Iron(III)-tosylate can greatly vary the DC conductivity of PEDOT-OTs along with molecular structure and doping concentration. For example, PEDOT-OTs prepared from methanol shows the conductivity of 19.5 S/cm, which is an increase by a factor of 108 compared to PEDOT-OTs prepared from acetone. From the X-ray diffraction (XRD) experiments, it was found that PEDOT-OTs with ketone is amorphous state, while PEDOT-OTs with alcoholic solvent shows the better defined crystalline structure in which the charge transport along and between the PEDOT chains are promoted. Chemical analysis employing X-ray photoelectron spectroscopy (XPS) revealed that the doping concentration of PEDOT-OTs with alcoholic solvent is much higher than that of PEDOT-OTs with ketones. It is proposed that the interactions between the organic solvent and doping anion can cause the variation in doping concentration and, therefore, result in the PEDOT-OTs of different conductivities and chain structures.

Original languageEnglish
Pages (from-to)363-368
Number of pages6
JournalPolymer (Korea)
Volume29
Issue number4
Publication statusPublished - 2005 Jul 1

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Keywords

  • Charge transport
  • DC conductivity
  • Iron(III)-p-toluenesulfonate (Fe(OTs))
  • Poly(3,4-ethylenedioxythiophene) (PEDOT)
  • X-ray photoelectron spectroscopy (XPS)

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry

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