Large-scale production and purification of single-walled carbon nanotubes
Rodriguez-Macias, Fernando J.
Smalley, Richard E.
Master of Arts
Single Walled Nanotubes were produced in large scale by Laser Vaporization with maximum yields of 50%. Optimization experiments give relative yields of (Nickel Cobalt (1:1 atomic % each)) = (Nickel Tungsten (1:1)) $>$ (Nickel Yttrium (1.6:0.4)/Cobalt Platinum (0.9:0.3)) $>$ (Nickel Platinum (0.9:0.3)/Cobalt Platinum (1:1)/Nickel Yttrium (4.2:1)/Nickel Molybdenum (1:1)) $\gg$ (Ruthenium (0.5)). For changes in atmosphere the yields are Argon (500 torr) = Carbon Monoxide (700 torr) = Argon (700 torr) $\gg$ Helium (500 torr). Differences in yields are discussed and compared to results from the electric arc technique. The setup has been successfully scaled-up and operates for more than 36 hours. The target preparation and SWNT material purification procedures have been optimized and scaled-up accordingly to obtain grams of 95% pure SWNT routinely. High quality material is now available, from a facility called "tubes@rice", for research purposes.
Physical chemistry; Chemical engineering; Engineering; Materials science