EXAFS and XANES investigations of CuFe 2O 4 nanoparticles and CuFe 2O 4-MO 2 (M = Sn, Ce) nanocomposites

Venkata Krishnan, Ramakrishnan Kalai Selvan, Chanassary Ouso Augustin, Aharon Gedanken, Helmut Bertagnolli

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

Structural investigations were performed on combustion synthesized CuFe 2O 4 nanoparticles and CuFe 2O 4-MO 2 (M = Sn, Ce) nanocomposites in different compositions, by means of X-ray absorption fine structure spectroscopy. The studies on CuFe 2O 4 nanoparticles reveal that the samples have a structure analogous to that of the bulk material, wherein all the copper ions occupy the octahedral sites and the iron ions are distributed between the tetrahedral and octahedral sites. The XAFS investigations on CuFe 2O 4-SnO 2 and CuFe 2O 4-CeO 2 nanocomposites show that the incorporation of the tetravalent metal ions in the spinel lattice does not alter the local structure around copper and iron in CuFe 2O 4 nanoparticles. The X-ray diffraction pattern indicates CuFe 2O 4 as a single phase in the nanoparticles and shows the incorporation of metal ions in the spinel structure in addition to the existence of MO 2 and CuFe 2O 4 phases in CuFe 2O 4-MO 2 nanocomposites. The nanometric size of the as-synthesized materials has been confirmed by transmission electron microscopy studies. The high-resolution transmission electron microscopy investigations also confirm that CuFe 2O 4 exists as a single phase and reveal the composite nature of CuFe 2O 4-MO 2 materials.

Original languageEnglish
Pages (from-to)16724-16733
Number of pages10
JournalJournal of Physical Chemistry C
Volume111
Issue number45
DOIs
StatePublished - 15 Nov 2007

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