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Mechanisms of Carbon Nanotube Production by Laser Ablation ProcessWe will present possible mechanisms for nanotube production by laser oven process. Spectral emission of excited species during laser ablation of a composite graphite target is compared with that of laser irradiated C60 vapor. The similarities in the transient and spectral data suggest that fullerenes are intermediate precursors for nanotube formation. The confinement of the ablation products by means of a 25-mm diameter tube placed upstream of the target seems to improve the production and purity of nanotubes. Repeated laser pulses vaporize the amorphous/graphitic carbon and possibly catalyst particles, and dissociate fullerenes yielding additional feedstock for SWNT growth.
Document ID
20000109878
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Scott, Carl D.
(NASA Johnson Space Center Houston, TX United States)
Arepalli, Sivaram
(GB Technology, Inc. Houston, TX United States)
Nikolaev, Pavel
(GB Technology, Inc. Houston, TX United States)
Smalley, Richard E.
(Rice Univ. Houston, TX United States)
Nocholson, Leonard S.
Date Acquired
August 19, 2013
Publication Date
January 1, 2000
Subject Category
Composite Materials
Meeting Information
Meeting: American Physical Society March Meeting 2000
Location: Minneapolis, MN
Country: United States
Start Date: March 20, 2000
Sponsors: American Physical Society
Funding Number(s)
PROJECT: RTOP 953-36-ES-95
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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