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Laser ablation for the synthesis of carbon nanotubes

United States Patent

April 6, 2010
View the Complete Patent at the US Patent & Trademark Office
Thomas Jefferson National Accelerator Facility - Visit the Technology Review Committee Website
Single walled carbon nanotubes are produced in a novel apparatus by the laser-induced ablation of moving carbon target. The laser used is of high average power and ultra-fast pulsing. According to various preferred embodiments, the laser produces an output above about 50 watts/cm.sup.2 at a repetition rate above about 15 MHz and exhibits a pulse duration below about 10 picoseconds. The carbon, carbon/catalyst target and the laser beam are moved relative to one another and a focused flow of "side pumped", preheated inert gas is introduced near the point of ablation to minimize or eliminate interference by the ablated plume by removal of the plume and introduction of new target area for incidence with the laser beam. When the target is moved relative to the laser beam, rotational or translational movement may be imparted thereto, but rotation of the target is preferred.
Holloway; Brian C. (Williamsburg, VA), Eklund; Peter C. (Boalsburg, PA), Smith; Michael W. (Newport News, VA), Jordan; Kevin C. (Newport News, VA), Shinn; Michelle (Newport News, VA)
Jefferson Science Associates (Newport News, VA)
10/ 188,525
July 3, 2002
The United States of America may have certain rights to this invention under Management and Operating Contract DE-AC05-84ER 40150 from the United States Department of Energy NASA Grant No. 301591; DOD DARPA/ARO Grant No. 334211; or NSF Grant No. 5-363388-A.