Abstract Submitted to the NANOTUBE-99 Workshop:

For many applications, it is critical to grow carbon nanotubes with desired size, structure and orientation in a controlled fashion. It has been reported that this can be achieved by chemical vapour deposition of nanotubes on metal catalysts embedded in mesoporous silica. However, the pores in silica are randomly distributed and the size is not easily to control. We report our recent study on the CVD growth of carbon nanotubes with metal catalysts embedded in semicrystalline mesoporous zeolites (MCM-41) and nanopore membranes. MCM-41 consists arrays of non-intersecting channels with tunable size from a few nanometers to about 10 nm. This makes it a perfect catalyst support to control the growth of carbon nanotubes. Our results indicated that ropes of single walled nanotubes can be grown on this substrate. Further work is in progress to investigate the relation of the nanotube diameter with the pore size. Nanopore membranes have better defined channels aligned perpendicular to the membrane surface. This would provide a better controll over the nanotube orientation. Promising field-emission devices and other applications could be developed through the design of mesoporous substrate materials.

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