Electronic, chemical and structural change induced by organic solvents in tosylate-doped poly(3,4-ethylenedioxythiophene) (PEDOT-OTs)

Tae Young Kim, Chang Mo Park, Jong Eun Kim, Kwang Suck Suh

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95 Citations (Scopus)

Abstract

The effects of organic solvent on the electronic, structural and chemical properties of tosylate-doped poly(3,4-ethylenedioxythiophene) (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 electrical conductivity of PEDOT-OTs along with molecular structure and doping concentration. For example, PEDOT-OTs prepared from methanol shows the conductivity of 20.1 S/cm, which is an increase by a factor of 107 compared to PEDOT-OTs prepared from acetone. From the X-ray diffraction (XRD) experiments, it was found that PEDOT-OTs samples prepared from ketone solvents are amorphous state, whereas PEDOT-OTs samples prepared from alcoholic solvents show 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 solvents is much higher than that of PEDOT-OTs with ketones. It is proposed that the interactions between the organic solvent and iron(III)-tosylate 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)169-174
Number of pages6
JournalSynthetic Metals
Volume149
Issue number2-3
DOIs
Publication statusPublished - 2005 Mar 31

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Keywords

  • Doping concentration
  • Electrical conductivity
  • Organic solvent
  • Poly(3,4-ethylenedioxythiophene)
  • Tosylate (p-toluene sulfonate)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Polymers and Plastics

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