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Large-Diameter Single-Wall Carbon Nanotubes Formed Alongside Small-Diameter Double-Walled Carbon Nanotubes

Kasperski, Anne and Weibel, Alicia and Datas, Lucien and De Grave, Eddy and Peigney, Alain and Laurent, Christophe Large-Diameter Single-Wall Carbon Nanotubes Formed Alongside Small-Diameter Double-Walled Carbon Nanotubes. (2015) Journal of Physical Chemistry C, 119 (3). 1524-1535. ISSN 1932-7447

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Official URL: http://dx.doi.org/10.1021/jp509080e

Abstract

Samples containing a majority of either single-wall carbon nanotubes (SWCNTs) or double-walled carbon nanotubes (DWCNTs) are prepared in the same catalytic chemical vapor deposition conditions but using slightly different catalytic materials, based on alumina impregnated with iron and molybdenum salts. There is a sharp SWCNTs-to-DWCNTs transition. By contrast to the usual findings, the selectivity is not correlated to the size of the iron-based catalyst nanoparticles, nor does the transition occur upon a decreasing carbon/catalyst ratio. The result is attributed to the increasing MoO3 concentration inducing modifications of the gas atmosphere, such as the formation of more reactive C2 species through C2H4 dissociation, which thus favors the nucleation and growth of a DWCNT. In the DWCNT sample, the average diameter of the SWCNTs is higher than the average outer diameter of the DWCNTs, which is uncommon, as many authors stress that SWCNTs show a lower diameter than DWCNTs. The study could provide guidelines for the synthesis of very small diameter DWCNTs.

Item Type:Article
Additional Information:Thanks to ACS Publications editor. The definitive version is available at http://pubs.acs.org The original PDF of the article can be found at The Journal of Physical Chemistry C website : http://pubs.acs.org/doi/full/10.1021/jp509080e
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Universiteit Gent - UGENT (BELGIUM)
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Deposited By: cirimat webmestre
Deposited On:09 Feb 2017 14:09

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