(Color online) Schematics of the fabrication process of Co-NiO-Ni core-shell nanotube arrays; (a) AAO template; (b) Ni nanotubes; (c) Ni-NiO nanotubes; (d)-(f) Co-NiO-Ni core-shell nanotube.
SEM and TEM image of as-grown Ni nanotube prepared by the AAO template; (a) Ni nanotube arrays; (b) and (c) a single Ni nanotube with the outer diameter about 200 nm; (d) high resolution TEM image of as-prepared Ni nanotubes. The inset of (d) is a SAED image.
(Color online) EDS analysis of the Co-NiO-Ni core-shell nanotubes. (a) TEM images of core-shell nanotubes. (b) EDS line profiles for the core-shell nanotube from to in panel (a). (c) SEM images of core-shell nanotubes. (d) EDS line scanning of core-shell nanotubes in panel (c). (e) and (f) EDS spectrums of Ni nanotubes and Co-NiO-Ni core-shell nanotubes.
(Color online) Typical magnetic hysteresis loops of (a) Ni and (b) Co-NiO-Ni core-shell nanotube arrays. (c) Angular dependent coercivity () of Ni and Co-NiO-Ni core-shell nanotube arrays, where represents the angle between the applied magnetic field and the nanotube axis.
(Color online) Magnetic hysteresis loops of (a) Ni nanotubes and (b) Co-NiO-Ni core-shell nanotubes at 5 K and 300 K. The insets of (a) and (b) show the corresponding enlarged () loops.
(Color online) M-T curves for the (a) Ni nanotubes and (b) Co-NiO-Ni core-shell nanotubes under ZFC and FC (H = 100 Oe) conditions.
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