The transformation of α-Fe nanoparticles into multi-domain FeNi-M3O4 (M = Fe, Ni) heterostructures by galvanic exchange

Rahiem Davon Slaton, In Tae Bae, Patrick S. Lutz, Laxmikant Pathade, Mathew M Maye

Research output: Contribution to journalArticle

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Abstract

In this work we describe a novel method to prepare multi-domain metal-metal oxide heterostructured nanoparticles (NPs). We investigated the ability of Ni(acac)2 to undergo galvanic exchange with pre-synthesized metallic α-Fe NPs. Findings indicate that an asymmetric heterostructure emerges from the exchange, which is followed by rapid oxidation to form a NiFe-M3O4 (M = Fe, Ni) alloy-oxide microstructure. Nucleation and growth was monitored using UV-vis and TEM, and crystal evolution, composition change, and oxidation states were measured by XRD and XPS respectively. Galvanic exchange and growth was studied by varying Ni:Fe molar feed ratios during synthesis. The findings indicate that at low Ni:Fe ratios, the NP forms multiple domains of oxides, whereas at higher ratios form regions with novel Ni-NiFe-M3O4 interfaces. These new heterostructures were highly magnetic, and the extent of magnetization was proportional to composition and morphology, where NPs prepared at high Ni:Fe feed ratios resulted in decreased saturation magnetization and increased magnetic hysteresis. The nickel deposition and NP growth mechanism was considered as a combination of both galvanic exchange and reduction, and the observed rapid oxidation of the remaining α-Fe core was considered in light of electron density change at the heterostructures interfaces. Nanomaterials like these may find use as components in magnetic storage and spintronic devices, probes in biomedicine, additives in corrosion resistant coatings, and even as 3D printing inks.

Original languageEnglish (US)
Pages (from-to)6367-6375
Number of pages9
JournalJournal of Materials Chemistry C
Volume3
Issue number24
DOIs
StatePublished - Jun 28 2015

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Heterojunctions
Nanoparticles
Oxides
Oxidation
Ion exchange
Metals
Magnetic storage
Magnetic hysteresis
Magnetoelectronics
Saturation magnetization
Nickel
Chemical analysis
Nanostructured materials
Ink
Carrier concentration
Magnetization
Nucleation
X ray photoelectron spectroscopy
Corrosion
Transmission electron microscopy

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

Cite this

The transformation of α-Fe nanoparticles into multi-domain FeNi-M3O4 (M = Fe, Ni) heterostructures by galvanic exchange. / Slaton, Rahiem Davon; Bae, In Tae; Lutz, Patrick S.; Pathade, Laxmikant; Maye, Mathew M.

In: Journal of Materials Chemistry C, Vol. 3, No. 24, 28.06.2015, p. 6367-6375.

Research output: Contribution to journalArticle

Slaton, Rahiem Davon ; Bae, In Tae ; Lutz, Patrick S. ; Pathade, Laxmikant ; Maye, Mathew M. / The transformation of α-Fe nanoparticles into multi-domain FeNi-M3O4 (M = Fe, Ni) heterostructures by galvanic exchange. In: Journal of Materials Chemistry C. 2015 ; Vol. 3, No. 24. pp. 6367-6375.
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