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TitleSynthesis, alignment, and magnetic properties of monodisperse nickel nanocubes
Publication TypeJournal Article
Year of Publication2012
AuthorsLagrow, A.P., Ingham B., Cheong S., Williams G.V.M., Dotzler C., Toney M.F., Jefferson D.A., Corbos E.C., Bishop P.T., Cookson J., and Tilley R.D.
JournalJournal of the American Chemical Society
Pagination855 - 858
Date Published2012
ISSN00027863 (ISSN)
KeywordsAligned arrays, article, Chemical analysis, Cubic shape, dispersion, Hexadecylamine, High resolution transmission electron microscopy, hydrogen, Hydrogen atmosphere, Magnetic Phenomena, Magnetic properties, Magnetic studies, Magnetism, metal nanoparticle, Metal precursor, Microscopy, Electron, Transmission, Mono-dispersed, Monodisperse, nanoanalysis, nanocrystal, Nanocubes, Nanomagnetics, Nanoparticle sizes, Nanoparticles, nanoshell, Nanostructures, Nickel, Nickel nanoparticles, Oxidation, particle size, purification, Saturation magnetization, Spherical nanoparticles, Superparamagnetics, Superparamagnetism, Surface active agents, surfactant, synthesis, Thermodynamics, Transmission electron microscopy, Trioctylphosphine oxide, Trioctylphosphines, X ray diffraction, X-ray diffraction techniques
AbstractThis Communication describes the synthesis of highly monodispersed 12 nm nickel nanocubes. The cubic shape was achieved by using trioctylphosphine and hexadecylamine surfactants under a reducing hydrogen atmosphere to favor thermodynamic growth and the stabilization of {100} facets. Varying the metal precursor to trioctylphosphine ratio was found to alter the nanoparticle size and shape from 5 nm spherical nanoparticles to 12 nm nanocubes. High-resolution transmission electron microscopy showed that the nanocubes are protected from further oxidation by a 1 nm NiO shell. Synchrotron-based X-ray diffraction techniques showed the nickel nanocubes order into [100] aligned arrays. Magnetic studies showed the nickel nanocubes have over 4 times enhancement in magnetic saturation compared to spherical superparamagnetic nickel nanoparticles. © 2011 American Chemical Society.

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