Journal of Nanoparticle Research

, Volume 11, Issue 6, pp 1429–1439 | Cite as

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

  • Nicolae Aldea
  • Rodica Turcu
  • Alexandrina Nan
  • Izabella Craciunescu
  • Ovidiu Pana
  • Xie Yaning
  • Zhonghua Wu
  • Doina Bica
  • Ladislau Vekas
  • Florica Matei
Research Paper


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.


X-ray spectroscopy Synchrotron radiation Local and global structure Magnetite 



Wave vector


Amplitude function


The radial distance


Number of atoms


Backscattering amplitude


Scattering parameter


Apodization windows


Experimental X-ray line profile


Instrumental X-ray line profile


True sample function


Fourier transform of h profile


Fourier transform of g profile


Fourier transform of true sample function


Fourier transform contribution about crystallite size and stocking fault probability

\( F^{(\epsilon)} (L) \)

Fourier transform contribution about microstrain of the lattice


Effective crystallite size

\( \langle \epsilon^{2} \rangle_{hkl} \)

Microstrain of the lattice


Parameters of generalized Fermi function


Uncertainties of atom numbers


Uncertainties of coordination shell


Uncertainties of K edge position


Full width at half maximum of true sample function


Crystallite size from Scherrer relation

Greek symbols


Absorption coefficient


EXAFS function


Root means squares


Mean free path function for inelastic scattering


Radial structure function


Integral width of experimental profile


Integral width of true sample function



Coordination shell


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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Nicolae Aldea
    • 1
  • Rodica Turcu
    • 1
  • Alexandrina Nan
    • 1
  • Izabella Craciunescu
    • 1
  • Ovidiu Pana
    • 1
  • Xie Yaning
    • 2
  • Zhonghua Wu
    • 2
  • Doina Bica
    • 3
  • Ladislau Vekas
    • 3
  • Florica Matei
    • 4
  1. 1.National Institute for Research and Development of Isotopic and Molecular TechnologiesCluj-NapocaRomania
  2. 2.Beijing Synchrotron Radiation Facilities of Beijing, Electron Positron ColliderNational LaboratoryBeijingPeople’s Republic of China
  3. 3.Romanian Academy, Timisoara BranchMagnetic Fluids LaboratoryTimisoaraRomania
  4. 4.Agriculture Sciences and Medicine Veterinary UniversityCluj-NapocaRomania

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