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Thermal Decomposition Synthesis of Iron Oxide Nanoparticles with Diminished Magnetic Dead Layer by Controlled Addition of Oxygen
journal contribution
posted on 2017-02-08, 00:00 authored by Mythreyi Unni, Amanda M. Uhl, Shehaab Savliwala, Benjamin H. Savitzky, Rohan Dhavalikar, Nicolas Garraud, David P Arnold, Lena F. Kourkoutis, Jennifer S. Andrew, Carlos RinaldiDecades
of research focused on size and shape control of iron oxide
nanoparticles have led to methods of synthesis that afford excellent
control over physical size and shape but comparatively poor control
over magnetic properties. Popular synthesis methods based on thermal
decomposition of organometallic precursors in the absence of oxygen
have yielded particles with mixed iron oxide phases, crystal defects,
and poorer than expected magnetic properties, including the existence
of a thick “magnetically dead layer” experimentally
evidenced by a magnetic diameter significantly smaller than the physical
diameter. Here, we show how single-crystalline iron oxide nanoparticles
with few defects and similar physical and magetic diameter distributions
can be obtained by introducing molecular oxygen as one of the reactive
species in the thermal decomposition synthesis. This is achieved without
the need for any postsynthesis oxidation or thermal annealing. These
results address a significant challenge in the synthesis of nanoparticles
with predictable magnetic properties and could lead to advances in
applications of magnetic nanoparticles.
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Dead Layerdecomposition synthesispostsynthesis oxidationcrystal defectsresults addressiron oxide nanoparticlesiron oxide phasesorganometallic precursorsPopular synthesis methodsshape controlOxygen DecadesThermal Decomposition SynthesisIron Oxide Nanoparticlessingle-crystalline iron oxide nanoparticlesControlled Additionreactive speciesmagetic diameter distributions
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