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Monodisperse MFe2O4 (M = Fe, Co, Mn) nanoparticles.

TitleMonodisperse MFe2O4 (M = Fe, Co, Mn) nanoparticles.
Publication TypeJournal Article
Year of Publication2004
AuthorsSun S, Zeng H, Robinson DB, Raoux S, Rice PM, Wang SX, Li G
JournalJ Am Chem Soc
Volume126
Issue1
Pagination273-9
Date Published2004 Jan 14
ISSN0002-7863
Abstract

High-temperature solution phase reaction of iron(III) acetylacetonate, Fe(acac)(3), with 1,2-hexadecanediol in the presence of oleic acid and oleylamine leads to monodisperse magnetite (Fe(3)O(4)) nanoparticles. Similarly, reaction of Fe(acac)(3) and Co(acac)(2) or Mn(acac)(2) with the same diol results in monodisperse CoFe(2)O(4) or MnFe(2)O(4) nanoparticles. Particle diameter can be tuned from 3 to 20 nm by varying reaction conditions or by seed-mediated growth. The as-synthesized iron oxide nanoparticles have a cubic spinel structure as characterized by HRTEM, SAED, and XRD. Further, Fe(3)O(4) can be oxidized to Fe(2)O(3), as evidenced by XRD, NEXAFS spectroscopy, and SQUID magnetometry. The hydrophobic nanoparticles can be transformed into hydrophilic ones by adding bipolar surfactants, and aqueous nanoparticle dispersion is readily made. These iron oxide nanoparticles and their dispersions in various media have great potential in magnetic nanodevice and biomagnetic applications.

DOI10.1021/ja0380852
Alternate JournalJ. Am. Chem. Soc.
PubMed ID14709092