Journal
SOLID STATE SCIENCES
Volume 10, Issue 3, Pages 316-320Publisher
ELSEVIER
DOI: 10.1016/j.solidstatesciences.2007.09.016
Keywords
composite; cobalt; carbon nanotubes; coercivity; microwave absorption
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Composites of flowery hexagonal close-packed (hcp) cobalt crystallite covered with multi-wall carbon nanotubes (MWCNTs) were fabricated in high yield via a simple catalytic pyrolysis method. A series of characterizations including X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) revealed that MWCNTs grew on the surface of the cobalt flowers, which possibly followed a bottom-growth model. Thus-prepared Co/CNT composites not only exhibited much higher coercivity (772 Oe) than that of the initial pure cobalt flowers (308 Oe), but also showed much-enhanced microwave absorption than that of pure Co flowers or CNTs. The enhancement mechanism was investigated on the basis of the magnetic properties of Co/CNT composite and electromagnetic theory. (c) 2007 Elsevier Masson SAS. All rights reserved.
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