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Optical Plasma Control During ARC Carbon Nanotube GrowthTo improve nanotube production, we developed a novel optical control technique, based on the shape of the visible plasma zone created between the anode and the cathode in the direct current (DC) arc process. For a given inert gas, we adjust the anode to cathode distance (ACD) in order to obtain strong visible vortices around the cathode. This enhance anode vaporization, which improve nanotubes formation. In light of our experimental results, we focus our discussion on the relationship between plasma parameters and nanotube growth. Plasma temperature control during arc process is achieved using argon, helium, and their mixtures as a buffer gases. The variation of the gas mixture from pure argon to pure helium changes plasma temperature. As a consequence, the microscopic characteristics of nanotubes as diameter distribution is changed moving from smaller values for argon to higher diameters for helium. We also observe a dependence of the macroscopic characteristics of the final products as Brunauer-Emmett-Teller (BET) surface area.
Document ID
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Hinkov, I.
(Paris XIII Univ. Villetaneuse, France)
Farhat, S.
(Paris XIII Univ. Villetaneuse, France)
DeLaChapelle, M. Lamy
(Tsinghua Univ. Bejing, China)
Fan, S. S.
(Tsinghua Univ. Bejing, China)
Han, H. X.
(Academia Sinica Beijing, China)
Li, G. H.
(Academia Sinica Beijing, China)
Scott, C. D.
(NASA Johnson Space Center Houston, TX United States)
Date Acquired
August 20, 2013
Publication Date
July 1, 2001
Publication Information
Publication: Proceedings of the Sixth Applied Diamond Conference/Second Frontier Carbon Technology Joint Conference (ADC/FCT 2001)
Subject Category
Solid-State Physics
Distribution Limits
Work of the US Gov. Public Use Permitted.
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