Uv-Vis./NIR and transport studies of chemically synthesized soluble polypyrrole

E. J. Oh, K. S. Jang, J. S. Suh, H. Kim, K. H. Kim, C. H. Yo, J. Joo

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    22 Citations (Scopus)

    Abstract

    Doped polypyrrole which is soluble in various organic solvents (m-cresol, chloroform, DMSO, NMP etc.) is synthesized. Homogeneous solutions prepared from the solvents show different behaviors at near IR region depending on the solvent used. The results may be explained by PPy conformation change depending on polarity and aromatic interaction of solvents and dopants. Amorphous X-ray diffraction pattern is observed in flexible free standing films cast from these solutions. The electrical conductivity of the materials is 10-2 ≃ 100S/cm at room temperature. Temperature dependence of dc conductivity (δdc) indicates that these materials show the three dimensional variable range hopping (VRH) model and show the relatively strong localization of charge. From the EPR experiment of PPy-NSA (m-cresol) sample, the density of state of the system is estimated as ≃0.06 states/eV ring.

    Original languageEnglish
    Pages (from-to)147-148
    Number of pages2
    JournalSynthetic Metals
    Volume84
    Issue number1-3
    DOIs
    Publication statusPublished - 1997 Jan

    Bibliographical note

    Funding Information:
    This work was supportedb y Basic Science Research Grant (BSRI-96-3424) of the ministry of Education, Korea and Korea Sciencea nd EngineeringF oundations(K OSEF).

    Keywords

    • Conductivity
    • Polypyrrole and derivatives
    • Solution processing
    • Transport measurements
    • UV-Vis-NIR absorption

    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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