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Synthesis of a soluble polyaniline–ferrite composite: magnetic and electric properties

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Abstract

We report the preparation of a processible magnetite/polyaniline (Fe3O4/PANI) nanocomposite, containing dodecylbencensulfonic acid (DBSA) as a surfactant and dopant, with both magnetic and conducting properties. Different amounts of Fe3O4 nanoparticles were successfully disposed with FeCl3 solution to prevent their aggregation in the solution by the application of common ion effect. The magnetic properties of the resulting composites were investigated by a quantum design magnetometer (PMPS). The (Fe3O4/PANI) nanocomposite showed at 300 K no loop of hysteresis indicating the superparamagnetic nature. The saturation magnetization varies from 0.167 to 28.45 emu/g with increasing Fe3O4 content. Zero field cooling (ZFC) and Field cooling (FC) profiles showed that the polyaniline matrix allows each ferrite nanoparticles to behave independently and interparticle interactions are not important for iron oxide content lower than 36 wt.%. The electrical conductivity of composites was found to be higher than that of the pure PANI in spite of the insertion of the insulating material Fe3O4 particles. It is noticeable that conductivity increases with low Fe3O4 particles content and then decreases. Structural characterization by X-ray diffraction (XRD), UV spectroscopy and thermogravimetric analysis (TGA) have been performed.

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Acknowledgements

The authors thank Dr. Troiani (CAB-CNEA) for TEM images. This work is supported by the University of Buenos Aires (grant I–055).

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Authors and Affiliations

  1. LAFMACEL, Facultad de Ingeniería, Universidad de Buenos Aires, Paseo Colón 850, Buenos Aires, 1063, Argentina

    Juan C. Aphesteguy & Silvia E. Jacobo

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  1. Juan C. Aphesteguy
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  2. Silvia E. Jacobo
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Correspondence to Silvia E. Jacobo.

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Aphesteguy, J.C., Jacobo, S.E. Synthesis of a soluble polyaniline–ferrite composite: magnetic and electric properties. J Mater Sci 42, 7062–7068 (2007). https://doi.org/10.1007/s10853-006-1423-7

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  • DOI: https://doi.org/10.1007/s10853-006-1423-7

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