Magnetic and conducting Fe3O4-polypyrrole nanoparticles with core-shell structure

Jianguo Deng, Yuxing Peng, Chuanlan He, Xingping Long, Pei Li, Albert S.C. Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

143 Citations (Scopus)


Magnetic and conducting Fe3O4-polypyrrole nanoparticles with core-shell structure were prepared in the presence of Fe3O4magnetic fluid in aqueous solution containing sodium dodecylbenzene-sulfonate (NaDS) as a surfactant and dopant. Both the conductivity and magnetization of the composites depend strongly on the Fe3O4content and the doping degree. With increase of Fe3O4content in the composite, the conductivity at room temperature decreases, but the saturated magnetization and coercive force increase. Transmission electron microscopy (TEM) images of Fe3O4and Fe3O4-polypyrrole particles show almost spherical particles with diameters ranging from 20 to 30 and 30 to 40 nm, respectively. The thermal stability of Fe3O4-polypyrrole composites is higher than that of pure polypyrrole. Studies of IR, UV-visible and X-ray photoelectron spectroscopy (XPS) spectra suggest that the increased thermal stability may be due to interactions between Fe3O4particles and polypyrrole backbone.
Original languageEnglish
Pages (from-to)1182-1187
Number of pages6
JournalPolymer International
Issue number7
Publication statusPublished - 1 Jul 2003


  • Conductivity
  • Core-shell nanostructure
  • Ferromagnetic properties
  • Polypyrrole

ASJC Scopus subject areas

  • Polymers and Plastics


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