In this study, we have found that the operating parameters such as furnace temperature, space velocity and carbon partial pressure impact nanotube production and quality. Data indicated that an increase in production rate is accompanied by an increased co-production of carbon nanofibers (> 100 nm diameter) or amorphous carbon. HRTEM inages obtained on several individual MWNTs revealed a correlation between the outer tube diameter with the size of the catalyst particle at the tip.
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