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Tunable Growth of Vertically Aligned Single-walled Carbon Nanotubes on Flat Surface: from Surface Morphology of Catalyst to Reaction Parameters

L. Zhang and D.E. Resasco
University of Oklahoma, US

Keywords:
vertically aligned single-walled carbon nanotubes, surface morphology

Abstract:
A simple thermal CVD method has been developed to grow vertical arrays of single-walled carbon nanotubes (VSWNT) on flat surface with Co/Mo bimetallic catalyst. Surface morphology of catalyst such as particle size and inter-particle spacing has been found to be decisive factor for growth of VSWNT and otherwise random network of single-walled carbon nanotubes (RSWNT). Therefore, proper arrangement of catalyst particles by various methods including drying process and masked patterning is capable to facilitate either large-area or localized growth of VSWNT with variation in height and density. Effect of reaction parameters such as temperature, pressure, flow rate and time span has also been studied to better understand the mechanism of SWNT generation and self-alignment. Combination of these parameters provide a scalable method to control growth of VSWNT for different applications.

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