Synthesis and characterization of carbon nanoribbons and single crystal iron filled carbon nanotubes

Mahanandia, P and Nanda, KK and Prasad, V and Subramanyam, SV (2008) Synthesis and characterization of carbon nanoribbons and single crystal iron filled carbon nanotubes. In: Materials Research Bulletin, 43 (12). pp. 3252-3262.

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Abstract

Carbon nanoribbons and single crystal iron filled multiwall carbon nanotubes (MWCNTs) have been synthesized by simple pyrolysis technique. SEM investigation shows that the material consist mainly carbon nanoribbons and carbon nanotubes (CNTs). X-ray diffraction (XRD), electron energy loss spectroscopy (EELS), electron energy dispersive X-ray (EDX), transmission electron miscroscopy (TEM) and highresolution transmission electron microscopy (HRTEM) studies reveal carbon nanotubes are filled with alpha-Fe. Closer inspection of HRTEM images indicated that the bee structure alpha-Fe nanowires are monocrystalline and Fe (1 1 0) plane is indeed perpendicular to the G (0 0 2) plane, whereas orientation of (0 0 2) lattice planes of carbon nanoribbon is perpendicular to the axis of growth. Magnetic properties studied by superconducting quantum interference device (SQUID) at 300 K and 10 K exhibited coercivity of 1037 Oe and 2023 Oe. The large coercitivity is strongly attributed to the small size monocrystalline single phase alpha-Fe, single domain nature of the encapsulated Fe crystal, magnetocrystal line shape anisotropy and ferromagnetic behaviour of localized states at the edges of the carbon nanoribbons.

Item Type:	Journal Article
Publication:	Materials Research Bulletin
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Nanostructures;Vapour deposition;X-ray diffraction;Magnetic properties.
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Physical & Mathematical Sciences > Physics
Date Deposited:	04 Nov 2009 06:36
Last Modified:	19 Sep 2010 04:58
URI:	http://eprints.iisc.ac.in/id/eprint/17820

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