Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 112, Issue 37, Pages 14281-14285Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp8035007
Keywords
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Funding
- Rensselaer Polytechnic Institute, Troy, New York
- Kerala State Council for Science, Technology and Environment [004/FSHIP/05/KSCSTE]
- DST-DAAD PPP
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Cobalt nanotubes (CoNTs) with very high longitudinal coercivity were prepared by electrodeposition of cobalt acetate for the first time by using anodized alumina (AAO) template. They were then characterized with X-ray diffraction (XRD), a field emission scanning electron microscope (FESEM), and a transmission electron microscope (TEM). Formation of a highly ordered hexagonal cobalt phase is observed. Room temperature SQUID (superconducting quantum interference device) magnetometer measurements indicate that the easy axis of magnetization is parallel to the nanotube axis. These CoNTs exhibit very high longitudinal coercivity of similar to 820 Oe. A very high intertubular interaction resulting from magnetostatic dipolar interaction between nanotubes is observed. Thick-walled nanotubes were also fabricated by using cobalt acetate tetrahydrate precursors. A plausible mechanism for the formation of CoNTs based on mobility assisted growth is proposed. The role of the hydration layer and the mobility of metal ions are elucidated in the case of the growth mechanism of one-dimensional geometry.
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