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Magnetic field sensor based on a maghemite/polyaniline hybrid material

  • ICAM 2009
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Abstract

A hybrid material containing maghemite and polyaniline (PAni) doped with dodecylbenzenesulfonic acid (DBSA) was prepared through in situ polymerization in aqueous medium. The pure maghemite powder presented average particle diameter of 10 nm and magnetization force of 14 mN. The obtained maghemite/PAni hybrid material also presented nanometric dimensions, associated with reasonable electrical conductivity (260 times larger than the electrical conductivity of the pure maghemite) and about 60% of the original magnetic force. Additionally, the electrical conductivity of the hybrid powder showed significant sensitivity to changes of the magnetic field, indicating that these materials can be useful as magnetic field sensors.

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Acknowledgements

The authors thank CNPq—Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq 577237/2008-0; CNPq 574358/2008-0; and CNPq 472009/2008-7); FAPERJ—Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ E-26/112.116/2008)—and CAPES (Rede NanoBiotec) for the financial support and the scholarships. Authors also thank Brazilian Synchrotron Laboratory for the support on SAXS (D11A-SAXS1 #8507/09 and #9077/10) and AFM (#8421/08 and #9637/10) experiments.

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Authors and Affiliations

  1. Instituto de Macromoléculas Professora Eloisa Mano, IMA/UFRJ, Universidade Federal do Rio de Janeiro, Cidade Universitária, CP 68525, Rio de Janeiro, CEP 21945-970, Brazil

    Fernando Gomes de Souza Jr. & Jéssica Alves Marins

  2. Programa de Engenharia Química/COPPE, Universidade Federal do Rio de Janeiro, Cidade Universitária, CP 68502, Rio de Janeiro, 21945-970 RJ, Brazil

    José Carlos Pinto

  3. Departamento de Química/CCE, Universidade Federal do Espírito Santo, Av. Fernando Ferrari, s/n, Goiabeiras, Vitória, 29075-910, Brazil

    Geiza Esperandio de Oliveira

  4. Instituto Federal do Espírito Santo (IFES), Unidade de Aracruz/ES, Av. Morobá S/N, Morobá, Aracruz E, CEP 29199000, Brazil

    Cezar Manzini Rodrigues

  5. Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Cidade Universitária, Rio de Janeiro, 21945-970 RJ, Brazil

    Luis Mauricio T. R. Lima

Authors
  1. Fernando Gomes de Souza Jr.
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  2. Jéssica Alves Marins
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  3. José Carlos Pinto
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  4. Geiza Esperandio de Oliveira
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  5. Cezar Manzini Rodrigues
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  6. Luis Mauricio T. R. Lima
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Correspondence to Fernando Gomes de Souza Jr..

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de Souza, F.G., Marins, J.A., Pinto, J.C. et al. Magnetic field sensor based on a maghemite/polyaniline hybrid material. J Mater Sci 45, 5012–5021 (2010). https://doi.org/10.1007/s10853-010-4321-y

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  • DOI: https://doi.org/10.1007/s10853-010-4321-y

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