Air- and water-resistant noble metal coated ferromagnetic cobalt nanorods
Résumé
Cobalt nanorods possess ideal magnetic properties for applications requiring magnetically hard nanoparticles. However, their exploitation is undermined by their sensitivity toward oxygen and water, which deteriorates their magnetic properties. The development of a continuous metal shell inert to oxidation could render them stable, opening perspectives not only for already identified applications but also for uses in which contact with air and/or aqueous media is inevitable. However, the direct growth of a conformal noble metal shell on magnetic metals is a challenge. Here, we show that prior treatment of Co nanorods with a tin coordination compound is the crucial step that enables the subsequent growth of a continuous noble metal shell on their surface, rendering them air- and water-resistant, while conserving the monocrystallity, metallicity and the magnetic properties of the Co core. Thus, the as-synthesized core-shell ferromagnetic nanorods combine high magnetization and strong uniaxial magnetic anisotropy, even after exposure to air and water, and hold promise for successful implementation in in vitro biodiagnostics requiring probes of high magnetization and anisotropic shape. © 2015 American Chemical Society.
Mots clés
cobalt
Cobalt compounds
core-shell
Core shell
Metals
Anisotropic shapes
Anisotropy
High magnetization
Ferromagnetism
Ferromagnetic materials
ferromagnetic
Chemicals removal (water treatment)
Metal coatings
Nanomagnetics
Uniaxial magnetic anisotropy
Tin coordination
Shells (structures)
Precious metals
nanorods
Magnetic anisotropy
Magnetic metals
Magnetic properties
Magnetism
Magnetization
water resistant
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