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Multiwall carbon nanotubes continuously filled with micrometre-length ferromagnetic α-Fe nanowires

Boi, F.S., Mountjoy, G., Wilson, R.M., Luklinska, Z., Sawiak, L.J., Baxendale, M. (2013) Multiwall carbon nanotubes continuously filled with micrometre-length ferromagnetic α-Fe nanowires. Carbon, 64 . pp. 351-358. ISSN 00086223 (ISSN). (doi:10.1016/j.carbon.2013.07.085) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Abstract

Carbon nanotubes filled with continuous crystalline nanowires of nanometre-scale diameter and micrometre-scale length of the ferromagnetic phase α-Fe were produced with a new chemical vapour deposition method. We report a new two-stage approach, a perturbed-vapour method of synthesis followed by a post-synthesis heat treatment that produces multiwall carbon nanotubes filled with at least 19 micrometre-length nanowires of α-Fe. Previously reported synthesis routes use steady-state conditions to guarantee nanowire continuity but result only in small (less than one-micrometre length) nanowires comprising isolated or mixed phases of either α-Fe, Fe3C, or γ-Fe. Here flower-like clusters of carbon nanotubes continuously filled with α-Fe were produced by perturbation of a laminar ferrocene (Fe(C 5H5)2) vapour flow in a conventional horizontal chemical vapour deposition reactor. Single-phase filling was achieved by a post-synthesis annealing at 500 C for 15 h in Ar flow. Electron microscopy studies revealed the high quality of the structural integrity of both nanotubes and encapsulated nanowires. These nanostructures possess a high coercivity of 580 Oe and a very high saturation magnetization of 189.5 emu/g comparable with bulk α-Fe. © 2013 Elsevier Ltd. All rights reserved.

Item Type: Article
DOI/Identification number: 10.1016/j.carbon.2013.07.085
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - Carbon [Field not mapped to EPrints] AD - School of Physics and Astronomy, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom [Field not mapped to EPrints] AD - School of Physical Sciences, University of Kent, Canterbury CT2 7NH, United Kingdom [Field not mapped to EPrints] AD - School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Chemical vapour deposition, Crystalline nanowires, Ferromagnetic phase, High coercivity, High-saturation magnetization, Steady-state condition, Synthesis route, Two-stage approaches, Carbon nanotubes, Chemical vapor deposition, Ferromagnetic materials, Ferromagnetism, Organometallics, Vapors, Nanowires
Subjects: Q Science > QC Physics > QC176 Solid state physics
Q Science > QC Physics
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Giles Tarver
Date Deposited: 16 Jan 2015 10:09 UTC
Last Modified: 29 May 2019 14:03 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46591 (The current URI for this page, for reference purposes)
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