Catalytic growth of single-wall carbon nanotubes from metal...

Details Catalytic growth of single-wall carbon nanotubes from metal... Catalytic growth of single-wall carbon nanotubes from metal...

C - Chemistry, Metallurgy

01

B

C01B 31/02 (2006.01)

Patent

CA 2344180

Single-walled carbon nanotubes have been synthesized by the catalytic decompo-sition of both carbon monoxide and ethylene over a supported metal catalyst know to produce larger multi-walled nanotubes. Under certain conditions, there is no termination of nanotube growth, and production appears to be limited only by the diffusion of reactant gas through the product nanotube mat that covers the catalyst. The present invention concerns a catalyst-substrate system which promotes the growth of nanotubes that are predominantly single-walled tubes in a specific size range, rather than the large irregular-sized multi-walled carbon fibrils that are known to grow from supported catalysts. With development of the supported catalyst system to provide an effective means for production of single-wall nanotubes, and further development of the catalyst geometry to overcome the diffusion limitation, the present invention will allow bulk catalytic production of predominantly single-wall carbon nanotubes from metal catalysts located on a catalyst supporting surface.

L'invention concerne des nanotubes en carbone à paroi simple synthétisés par la décomposition catalytique à la fois du monoxyde de carbone et de l'éthylène au dessus d'un catalyseur métallique supporté servant à produire des nanotubes à plusieurs parois plus grands. Sous certaines conditions, il n'y a aucune terminaison de croissance de nanotube, la production n'apparaissant être limitée que par la diffusion d'un gaz réactif à travers le mat de nanotube qui couvre le catalyseur. L'invention concerne également un dispositif de substrat catalyseur qui favorise la croissance des nanotubes qui sont majoritairement des tubes à paroi simple dans une gamme de dimensions spécifiques, plutôt que de grandes fibrilles en carbone à plusieurs parois de dimensions irrégulières que l'on fait croître à partir de catalyseurs supportés. La mise au point du système de catalyseur supporté destiné à fournir un dispositif efficace de production de nanotubes à paroi simple, puis la mise au point de la géométrie catalytique afin de surmonter la limitation de diffusion permettront une production catalytique à grande échelle de nanotubes en carbone majoritairement à paroi simple à partir de catalyseurs métalliques placés sur la surface d'un support catalytique.

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