DC Biasing Effects on Carbon Nanotube Formation in Microgravity Diffusion Flame

Int. J. Microgravity Sci. Appl. 2007p220
Author
H. ITO, Y. NAKADE, T. UCHIYAMA and O. FUJITA
Organization
Department of Mechanical and Space Engineering, Hokkaido University
Abstract
The effects of a direct-current electric field on carbon nanotube(CNT) synthesis in a flame method utilizing a planar siffusion flame were investigated under microgravity and atmospheric pressure. Ethylenen and oxidizer(75vol%O2-25vol%Ar) are supplied to the parallel rectangular burner to foem the planar diffusion flame above it. 100%Ar is ventilated around the flame. ferrocene was used as a metal catalyst for CNT formation. Carbonaceous compounds generated in the flame were collected on biased TEM grids and analyzed by TEM. The results showed that electric bias strongly affects the CNT formation. One new finding of the study is the existence of a specific ccondition to generate large amounts of CNT with aid of DC bias, where no CNT was formed without the DC bias.
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