US Patent 7744843 - Bulk synthesis of CNTs

http://www.freepatentsonline.com/7744843.html

This patent from Drexel University teaches a way of using chlorine gas to facilitate the mass production of single walled carbon nanotubes. Claim 5 reads:

5. A method for synthesizing carbon nanotubes, comprising:

extracting metal from a carbide substrate using one or more halogens at a temperature in the range of from about 700 C. to about 2000 C.; and

growing carbon nanotubes in a non-vacuum pressure environment on the substrate upon conversion of the carbide substrate into carbon.