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Structural and sensing properties of a novel Fe/Fe2O3/polyoxocarbosilane core shell nanocomposite powder prepared by laser pyrolysis

  • Nano May 2006
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Abstract

This paper reports about the synthesis and characterization of a novel Fe/Fe2O3/polyoxocarbosilane core shell nanocomposite as a material for gas-sensing applications. The nanocomposites (Fe-based nano cores enveloped with polymeric polyoxocarbosilane shells) were prepared by the IR laser co-pyrolysis of iron pentacarbonyl and hexamethyldisiloxane. The iron-based cores become superficially oxidized in atmosphere. The morphologies, chemical content and thermal behavior were studied by different analytical techniques. The sensing properties of the polymer-poor nanocomposite thick films were tested by measuring the variation of the electrical resistance in presence of CO and CH4, at a working temperature of 450 °C. Preliminary results indicate that for CO toxic gas, an n–p transitional character of the semiconducting iron oxide appears in humid relatively to dry air.

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Acknowledgements

Support of this research by the Project No 4589-CEEX/2006 of the Romanian Ministry of Education and Research, is gratefully acknowledged.

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Authors and Affiliations

  1. National Institute of Materials Physics, P.O. Box MG-7, RO-077125, Bucharest, Romania

    A. Tomescu

  2. National Institute for Lasers, Plasma and Radiation Physics Bucharest, P.O. Box MG-36, R-76900, Bucharest, Romania

    R. Alexandrescu, I. Morjan, F. Dumitrache, L. Gavrila-Florescu, R. Birjega & I. Soare

  3. Ovidius University, P.O. Box 8600, Constanta, Romania

    G. Prodan

  4. J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, 182 23, Prague, Czech Republic

    Z. Bastl

  5. Institute for Chemical Process Fundamentals of the Czech Academy of Science, 165 02, Prague 6, Czech Republic

    A. Galikova & J. Pola

Authors
  1. A. Tomescu
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  2. R. Alexandrescu
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  3. I. Morjan
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  4. F. Dumitrache
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  5. L. Gavrila-Florescu
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  6. R. Birjega
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  7. I. Soare
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  8. G. Prodan
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  9. Z. Bastl
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  10. A. Galikova
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  11. J. Pola
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Correspondence to R. Alexandrescu.

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Tomescu, A., Alexandrescu, R., Morjan, I. et al. Structural and sensing properties of a novel Fe/Fe2O3/polyoxocarbosilane core shell nanocomposite powder prepared by laser pyrolysis. J Mater Sci 42, 1838–1846 (2007). https://doi.org/10.1007/s10853-006-0956-0

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  • DOI: https://doi.org/10.1007/s10853-006-0956-0

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