Research Paper

Journal of Nanoparticle Research

, Volume 11, Issue 6, pp 1429-1439

Investigation of nanostructured Fe3O4 polypyrrole core-shell composites by X-ray absorbtion spectroscopy and X-ray diffraction using synchrotron radiation

  • Nicolae AldeaAffiliated withNational Institute for Research and Development of Isotopic and Molecular Technologies Email author 
  • , Rodica TurcuAffiliated withNational Institute for Research and Development of Isotopic and Molecular Technologies
  • , Alexandrina NanAffiliated withNational Institute for Research and Development of Isotopic and Molecular Technologies
  • , Izabella CraciunescuAffiliated withNational Institute for Research and Development of Isotopic and Molecular Technologies
  • , Ovidiu PanaAffiliated withNational Institute for Research and Development of Isotopic and Molecular Technologies
  • , Xie YaningAffiliated withBeijing Synchrotron Radiation Facilities of Beijing, Electron Positron Collider, National Laboratory
  • , Zhonghua WuAffiliated withBeijing Synchrotron Radiation Facilities of Beijing, Electron Positron Collider, National Laboratory
  • , Doina BicaAffiliated withRomanian Academy, Timisoara Branch, Magnetic Fluids Laboratory
  • , Ladislau VekasAffiliated withRomanian Academy, Timisoara Branch, Magnetic Fluids Laboratory
    • , Florica MateiAffiliated withAgriculture Sciences and Medicine Veterinary University

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Abstract

In this article, we focus on the structural peculiarities of nanosized Fe3O4 in the core-shell nanocomposites obtained by polymerization of conducting polypyrrole shell around Fe3O4 nanoparticles. The local structure of Fe atoms was determined from the Extended X-ray Absorption Fine Structure analysis using our own package computer programs. An X-ray diffraction method that is capable to determine average particle size, microstrains, as the particle size distribution of Fe3O4 nanoparticles is presented. The method is based on the Fourier analysis of a single X-ray diffraction profile using a new fitting method based on the generalized Fermi function facilities. The crystallites size obtained by X-ray diffraction spectra analysis was estimated between 3.2 and 10.3 nm. Significant changes in the first and the second Fe coordination shell in comparison with standard bulk were observed. The global and local structure of the nanosized Fe3O4 are correlated with the synthesis conditions of the core-shell polypyrrole nanocomposites.

Keywords

X-ray spectroscopy Synchrotron radiation Local and global structure Magnetite