Titre du document / Document title
Surface area and thermal stability effect of the MgO supported catalysts for the synthesis of carbon nanotubes
Auteur(s) / Author(s)
YANG XU (1) ;
ZHONGRUI LI (1) ;
DERVISHI Enkeleda (1) ;
SAINI Viney (1) ;
JINGBIAO CUI (2) ;
BIRIS Alexandru R. (3) ;
LUPU Dan (3) ;
BIRIS Alexandru S. (1) ;
Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)
(1) Nanotechnology Center and Applied Science Department, University of Arkansas, Little Rock, AR, 72204, ETATS-UNIS
(2) Physics and Astronomy, University of Arkansas, Little Rock, AR, 72204, ETATS-UNIS
(3) National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj Napoca, RO, 3400, ROUMANIE
Résumé / Abstract
Surface area (SA) of the oxide support was found to play a major role on the morphology, quality of the single wall carbon nanotubes (SWNTs) growth. Fe-Co bimetal was supported onto MgO powders with different surface areas, and used for the SWNTs synthesis from the pyrolysis of CH
4 through radio frequency catalytic chemical vapor deposition (RF-CCVD). The high surface area MgO showed specificity towards the growth of SWNTs even at the very high metal loadings of 17.4%. As the MgO surface areas decreased, the agglomeration of the active metal species on the support, nanotubes with wider diameter distributions and more graphitic walls were obtained. This surface area effect suggested that the high surface area networks were responsible for a more effective confinement of the active metal nanoparticles that impeded their migration during the SWNTs thermal growth process. Therefore, by adjusting the surface area or chemical morphology of the catalyst systems, SWNTs with narrower diameter distribution and specific chiralities can be grown.
Revue / Journal Title
Journal of material chemistry
ISSN
0959-9428
Source / Source
2008, vol. 18, n
o47, pp. 5738-5745 [8 page(s) (article)] (33 ref.)
Langue / Language
Anglais
Editeur / Publisher
Royal Society of Chemistry, Cambridge, ROYAUME-UNI
(1991)
(Revue)
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Localisation / Location
INIST-CNRS, Cote INIST : 22603, 35400018508060.0040
Nº notice refdoc (ud4) : 20971481
