An organometallic approach for very small maghemite nanoparticles: Synthesis, characterization, and magnetic properties

Arnaud Glaria, Myrtil L. Kahn, Andrea Falqui, Pierre Lecante, Vincent Collière, Marc Respaud, Bruno Chaudret

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Maghemite (γ-Fe2O3) nanoparticles stabilized by long-alkyl-chain amines are synthesized by using an organometallic approach. This method consists of the hydrolysis and oxidation of an organometallic precursor, Fe[N(SiMe3)2]2, in the presence of amine ligands as stabilizing agent in an organic solvent, namely tetrahydrofuran or toluene. Whatever the experimental conditions, particles with a diameter of 2.8 nm are obtained. The use of high-resolution transmission electron microscopy and wide-angle X-ray scattering, together with Mössbauer spectroscopy and SQuId magnetometry, allows a complete characterization of these particles. Herein, we show that their structure is composed of a wellordered core surrounded by a more disordered shell. The size of the latter varies from 0.65 to 0.50 nm depending on the experimental conditions and is of prime importance for the understanding of the magnetic properties. We demonstrate that the shorter the alkyl chain length of the amine 1) the better the crystallinity of the particle's core and 2) the stronger the interparticle interactions.

Original languageEnglish (US)
Pages (from-to)2035-2041
Number of pages7
JournalChemPhysChem
Volume9
Issue number14
DOIs
StatePublished - Oct 6 2008

Keywords

  • Maghemite
  • Magnetic properties
  • Moessbauer spectroscopy
  • Nanoparticles
  • Organometallics

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

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