Zheng Z, Xu B, Huang L, He L, Ni XM (2008) Novel composite of Co/carbon nanotubes: Synthesis, magnetism and microwave absorption properties. Solid State Sciences 10(3), 316-320. [In English]

Web link: http://dx.doi.org/10.1016/j.solidstatesciences.2007.09.016

Keywords:

composite, cobalt, carbon nanotubes, coercivity, microwave absorption, carbon nanotubes, nickel nanoparticles, microspheres, cobalt

Abstract: 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.