NASA Technical Reports Server (NTRS) 20060055390: Carbon Nanotube Activities at NASA-Johnson Space Center

41.8 MB·English

by  NASA Technical Reports Server (NTRS)

Source of Acquisition
NASA Johnson Space Center
Sivaram Arepalli
NASA-Johnson Space Center
Houston, TX 77058
Abstract
Research activities on carbon nanotubes at NASA-Johnson Space Center include production,
purification, characterization and their applications for human space flight. In-situ diagnostics
during nanotube production by laser oven process include collection of spatial and temporal data
of passive emission and laser induced fluorescence from C2, C3 and Nickel atoms in the plume
El]. Details of the results from the “parametric study” of the pulsed laser ablation process
indicate the effect of production parameters including temperature, buffer gas, flow rate,
pressure, and laser fluence [2]. Improvement of the purity by a variety of steps in the purification
process is monitored by characterizatio-n techniques including SEM, TEM, Raman, UV-VIS-NIR
and TGA. A recently established NASA-JSC protocol [3] for SWCNT characterization is
undergoing revision with feedback from nanotube community. Efforts at JSC over the past five
years in composites have centered on structural polymednanotube systems. Recent activities
broadened this focus to multifunctional materials, supercapaciotrs, fuel cells, regenerable CO2
absorbers, electromagnetic shielding, radiation dosimetry and thermal management systems of
interest for human space flight. Preliminary tests indicate improvement of performance in most
of these applications because of the large surface area as well as high electrical and thermal
conductivity exhibited by SWCNTs.
References :
1) Carl. D. Scott, Sivaram Arepalli, Pave1 Nikolaev and R. E. Smalley, “Growth Mechanisms for Single-
wall Carbon Nanotubes in a Laser Ablation Process”, Applied Physics A, Vol. 72, May 200 1, p p.
573-580 (2001)
2) Arepalli S., Holmes W. A., Nikolaev P., Hadjiev V. G., and Scott C. D., “A Parametric Study
of Singlewall Carbon Nanotube Growth by Laser Ablation”, J. Nanosci and Nanotech.
Vol. 4,737-747 (2004).
3) Arepalli S., Nikolaev P., Gorelik O., Hadjiev V. G., Holmes W. A., Files B. S., and Yowell L.,
“Protocol for the Characterization of Single-W all Carbon Nanotube Material Quality”,
Carbon, Vol. 42, p. 1783-1791 (2004).
Contact: s.aremIli@,isc.nasa.gov ;2 8 1-483-5910

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