Electro-conductive properties of poly(3,4-ethylenedioxythiophene)/poly(ionic liquid) films with respect to its structure and morphology

Tae Hee Lee, Tae Young Kim, Ha Thi Thuy Duong, Jong Eun Kim, Kwang S. Suh

Research output: Contribution to journalArticle

4 Citations (Scopus)


Poly(3,4-ethylenedioxythiophene) (PEDOT)/poly(1-vinyl-3-ethylimidazolium+ (trifluoromethane sulfonyl)imide-) (PIL) complexes were prepared at various PEDOT/PIL molar ratios and dispersed in propylene carbonate at a concentration of 1 wt%. After casting, the maximum conductivity was measured to be 1.2 × 10-1 S/cm, which could be explained by the 3D variable range hopping model. The optimum surface roughness of the PEDOT/PIL film was measured, showing Sa and Sq values of 5.92 and 11.0 nm, respectively. The conductivity of the polymerized PEDOT without a template process had low conductivity due to its poor surface roughness and large particle size. Therefore, the conductivity of PEDOT/PILs is determined by the particle size, crystallinity and surface morphology. These results were supported by surface mapping microscopy, X-ray photon spectroscopy, and X-ray diffraction.

Original languageEnglish
Pages (from-to)2453-2457
Number of pages5
JournalSynthetic Metals
Issue number23-24
Publication statusPublished - 2009 Dec 1



  • Conducting polymers
  • Conductivity
  • Morphology
  • Poly(3,4-ethylenedioxythiophene)
  • Polymeric ionic liquids
  • X-ray

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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