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Carbon Nanotubes Growth on Graphite FibersCarbon nanotubes (CNT) were synthesized on graphite fibers by thermal Chemical Vapor Deposition (CVD). On the fiber surface, iron nanoparticles are coated and act as catalysts for CNT growth. The growth temperature ranges from 550 to 1000 C at an ambient pressure. Methane and hydrogen gases with methane contents of 10% to 100% are used for the CNT synthesis. At high growth temperatures (greater than 800 C), the rapid inter-diffusion of the transition metal iron on the graphite surface results in a rough fiber surface with no CNT grown on the surface. When the growth temperature is relatively low (650 - 800 C), CNT are fabricated on the graphite surface with catalytic particles on the nanotube top ends. Using micro Raman spectroscopy in the breath mode region, single-walled or multi-walled CNT can be determined, depending on methane concentrations.
Document ID
20020066654
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Zhu, Shen
(Universities Space Research Association Huntsville, AL United States)
Su, Ching-Hua
(NASA Marshall Space Flight Center Huntsville, AL United States)
Lehoczky, S. L.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Muntele, I.
(Alabama Agricultural and Mechanical Univ. Normal, AL United States)
Ila, D.
(Alabama Agricultural and Mechanical Univ. Normal, AL United States)
Curreri, Peter A.
Date Acquired
August 20, 2013
Publication Date
January 1, 2002
Subject Category
Solid-State Physics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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