Growth mechanisms and oxidation resistance of gold-coated iron nanoparticles

Sung Jin Cho, Juan Carlos Idrobo, Justin Olamit, Kai Liu, Nigel D. Browning, Susan M. Kauzlarich

Research output: Contribution to journalArticlepeer-review

198 Scopus citations

Abstract

We report the chemical synthesis of Fe-core/Au-shell nanoparticles by a reverse micelle method and the investigation of their growth mechanisms and oxidation-resistant characteristics. The core-shell structure and the presence of the Fe and Au phases have been confirmed by transmission electron microscopy, energy dispersive spectroscopy, X-ray diffraction, Mössbauer spectroscopy, and inductively coupled plasma techniques. Additionally, atomic-resolution Z-contrast imaging and electron energy loss spectroscopy (EELS) in a scanning transmission electron microscope (STEM) have been used to study details of the growth processes. The Au shell grows by nucleating on the Fe-core surface before coalescing. The magnetic moments of such nanoparticles, in the loose powder form, decrease over time due to oxidation. The less than ideal oxidation resistance of the Au shell may have been caused by the rough Au surfaces. However, in pressed pellet form, electrical transport measurements show that the particles are fairly stable, as the resistance of the pellet does not change appreciably over time.

Original languageEnglish (US)
Pages (from-to)3181-3186
Number of pages6
JournalChemistry of Materials
Volume17
Issue number12
DOIs
StatePublished - Jun 14 2005

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

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