Research Center for Engineering of
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Title: Investigation of nanostructured Fe3O4 polyppyrole core-shell composites by X-ray absorbtion spectroscopy and X-ray diffraction using synchrotron radiation
Published In: Journal of Nanoparticle Research, Vol. 11, No. 6, pp. 1429-1439
Description: In this article, we focus on the structural peculiarities of nanosized Fe(3)O(4) in the core-shell nanocomposites obtained by polymerization of conducting polypyrrole shell around Fe(3)O(4) 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 Fe(3)O(4) 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 Fe(3)O(4) are correlated with the synthesis conditions of the core-shell polypyrrole nanocomposites.
ISBN: 
ISSN:ISSN: 1388-0764
DOI:DOI: 10.1007/s11051-008-9536-3
Publication year: 2009
Keywords:X-ray spectroscopy; Synchrotron radiation; Local and global structure; Magnetite
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Authors: ALDEA Nicolae , TURCU Rodica , NAN Alexandrina , CRACIUNESCU Izabella , PANA Ovidiu , YANING Xie , WU Zhonghua , BICA Doina , VEKAS Ladislau , MATEI Florica ,
Type: International Journal Article
Link: http://dx.doi.org/10.1007/s11051-008-9536-3
Laboratory: Magnetometry Laboratory
Institution: ARFT