Nickel/iron oxide nanocrystals with a nonequilibrium phase: Controlling size, shape, and composition

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DOIResolve DOI: http://doi.org/10.1021/cm501881a
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TypeArticle
Journal titleChemistry of Materials
ISSN0897-4756
Volume26
Issue16
Pages47964804; # of pages: 9
SubjectDecomposition; Iron; Medical applications; Nanoparticles; Nickel; Single crystals; Structural geology; Biomedical applications; Elevated temperature; Equilibrium phase diagrams; Large-scale deployment; Monodisperse nanoparticles; Non-equilibrium phase; Oxide nanocrystals; Poor solubilities; Synthesis (chemical)
AbstractMixed nickel iron oxide nanomaterials have great potential for use in fields as wide-ranging as optics, water oxidation catalysis, and biomedical applications; large-scale deployment for any of these applications is possible due to the abundance of iron and nickel in the earth's crust. Here, we describe single-crystal mixed nickel iron oxide nanoparticles with a rocksalt crystal structure and an iron content greater than >10 at%. The nanoparticles were synthesized via thermal decomposition of nickel and iron oleates, yielding monodisperse nanoparticles <12 nm in size. A range of compositions were accessible, ranging from iron-poor to iron-rich. Despite the predicted poor solubility of iron in the NiO lattice, as based upon the equilibrium phase diagram, and the general tendency of pure FexO to oxidize, the single-crystal nanoparticles are nonetheless kinetically persistent even at elevated temperatures (200 °C). Furthermore, by controlling the drying conditions and decomposition time of the oleate precursors as well as the initial ratio of nickel to iron in the precursor oleate mixture a variety of nanoparticle shapes-namely stars, cubes, and spheres-were formed. This control of shape and composition affords tunability of physical properties, exemplified by magnetic properties herein.
Publication date
PublisherAmerican Chemical Society
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); National Institute for Nanotechnology
Peer reviewedYes
NPARC number21272906
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Record identifier1ad07b5e-194b-42c9-919b-bf98553736f7
Record created2014-12-03
Record modified2016-05-09
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