Abstract
In order to control the morphology of single-walled carbon nanotubes (SWNTs) grown on a flat substrate by using CO catalytic chemical vapor deposition (COCCVD) method, several catalysts preparation methods and different amount of hydrogen addition are examined. As a result, we found optimum conditions for the sparse horizontal growth and novel vertically aligned growth. From this experimental survey, we discuss that the distance between catalyst nano-particles on a substrate has a crucial role for the determination of the final morphology of SWNTs. Vertically aligned growth is obtained by decreasing the distance between catalyst nano-particles during catalysts preparation, and by preventing from the deactivation of catalysts particle due to wrapping of carboneous material at the initial stages of CVD.
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