Characterization of polypyrrole-silver nanocomposites prepared in the presence of different dopants

Enikõ Pintér, Rita Patakfalvi, Tamás Fülei, Zoltán Gingl, Imre Dékány, Csaba Visy

Research output: Article

72 Citations (Scopus)

Abstract

Conducting polypyrrole (PPy) powder synthesized by using FeCl3 × 6 H2O and/or Fe(NO3)3 oxidants was impregnated in silver salt solutions. The stability and decomposition of the material was followed by thermogravimetric measurements. The total silver content was determined by atom absorption spectroscopy (ICP-AAS). The heat and electric conductivities of the composites were measured and correlated with the silver content. The incorporated silver was speciated and measured by X-ray diffraction (XRD). The spectra proved that the chemical state of the silver incorporated into the composite depends on the anion used in the polymerization process. In the case of the polymerization in a nitrate ion containing solution, the impregnation leads exclusively to the formation of metallic silver. The size distribution of the AgCl and Ag nanoparticles, determined from transmission electron microscopy (TEM) pictures in the different composites, proves the formation of a rather uniform species below 10 and 7 nm, respectively. The observations can be correlated with the different interactions in the PPy-chloride/nitrate-silver systems. The redox type interaction based conclusions can be considered as a guide during the preparation of other metal-conducting polymer composites.

Original languageEnglish
Pages (from-to)17474-17478
Number of pages5
JournalJournal of Physical Chemistry B
Volume109
Issue number37
DOIs
Publication statusPublished - szept. 22 2005

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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