Dependence of pH and surfactant effect in the synthesis of magnetite (Fe3O4) nanoparticles and its properties

A. P.A. Faiyas, E. M. Vinod, J. Joseph, R. Ganesan, R. K. Pandey

Research output: Contribution to journalArticle

81 Citations (Scopus)

Abstract

Nanoparticles of Fe3O4 were synthesized by co-precipitation in an aqueous solution containing ferrous and ferric salts (1:2) at varying pH with ammonia as a base. It was found that the value of pH influences the reaction mechanism for the formation of Fe3O4. Furthermore, the addition of mercaptoethanol significantly reduced the crystalline size of Fe3O4 nanoparticles from 15.03 to 8.02 nm. X-ray diffraction (XRD) spectra revealed that the synthesized nanoparticles were ε-Fe2O3 or Fe3O4 phase. To further prove the composition of the product, as-prepared Fe3O4 were examined by X-ray photoelectron spectroscopy (XPS). Magnetic properties of the obtained particles were determined by vibrating sample magnetometer (VSM). Further analysis of the X-ray studies shows that while maintaining a pH value of 6 and 9 in a solution containing iron salts II and III ions produces ε-Fe2O3. Whereas a pH value of 11 produces magnetite (Fe3O4) phase. All of these results show that the pH has a major role in the observed phase formation of (Fe3O4) nanoparticles.

Original languageEnglish
Pages (from-to)400-404
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume322
Issue number4
DOIs
Publication statusPublished - 1 Feb 2010

Keywords

  • Magnetic nanoparticles
  • XPS
  • XRD
  • pH value

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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