TY - JOUR
T1 - Air- and Water-Resistant Noble Metal Coated Ferromagnetic Cobalt Nanorods
AU - Lentijo-Mozo, Sergio
AU - Tan, Reasmey p.
AU - Garcia-Marcelot, Cécile
AU - Altantzis, Thomas
AU - Fazzini, Pier-Francesco
AU - Hungria, Teresa
AU - Cormary, Benoit
AU - Gallagher, James r.
AU - Miller, Jeffrey t.
AU - Martinez, Herve
AU - Schrittwieser, Stefan
AU - Schotter, Joerg
AU - Respaud, Marc
AU - Bals, Sara
AU - Tendeloo, Gustaaf van
AU - Gatel, Christophe
AU - Soulantica, Katerina
PY - 2015/3/24
Y1 - 2015/3/24
N2 - 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.
AB - 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.
U2 - 10.1021/nn506709k
DO - 10.1021/nn506709k
M3 - Article
SN - 1936-0851
VL - 9
SP - 2792
EP - 2804
JO - ACS Nano
JF - ACS Nano
IS - 3
ER -