Boundary layer chemical vapor synthesis of self-organized radial filled-carbon-nanotube structures

Boi, F.S. and Mountjoy, G. and Baxendale, M. (2013) Boundary layer chemical vapor synthesis of self-organized radial filled-carbon-nanotube structures. Carbon, 64 . pp. 516-526. ISSN 00086223 (ISSN). (doi:https://doi.org/10.1016/j.carbon.2013.08.001) (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

We report a new chemical vapor synthesis method that exploits random fluctuations in the viscous boundary layer between a laminar vapor flow and a surface to yield a not previously observed product: radial ferromagnetically filled-carbon-nanotube structures departing from a central particle. The filling of the nanotube capillary is continuous over a scale much greater than that which can be achieved by conventional CVD. This is a simple method which does not require ultra-fine control of process parameters or highly-engineered reactor components in which a single, self-organized, ordered product is formed in randomly fluctuating vapor in the boundary layer by vapor-, liquid-, solid-phase self-organization. These fluctuations create the thermodynamic conditions for formation of the central particle in the vapor which in turn defines the spherically symmetric diffusion gradient that initiates the radial growth. The subsequent radial growth is driven by the supply of vapor feedstock by local diffusion gradients created by endothermic graphitic carbon formation at the vapor-facing tips of the individual nanotubes and is halted by contact with the surface. The radial structures are the dominant product and the reaction conditions are self-sustaining. We argue that the method has potential for scalable production of metal-carbon nanostructures with other unusual morphologies. © 2013 Elsevier Ltd. All rights reserved.

Item Type: Article
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] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Chemical vapor synthesis, Diffusion gradients, Process parameters, Random fluctuation, Reaction conditions, Scalable production, Thermodynamic conditions, Viscous boundary layers, Boundary layers, Carbon nanotubes, Nanotubes, Synthesis (chemical), Vapors
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 14:54 UTC
Last Modified: 27 Feb 2015 10:25 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46592 (The current URI for this page, for reference purposes)
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