US Patent 7803346 - Method of selecting CNT structure through photoirradiation

http://ip.com/patent/US7803346

This is the latest patent from the researcher (Sumio Iijima) often credited with the discovery of carbon nanotubes and teaches a way to isolate CNTs of a single diameter. Claim 1 reads:

1. A method for selecting single-walled carbon nanotubes of 1.2 nm diameter from a mixture of single-walled carbon nanotubes of various diameters, comprising irradiating the mixture of single-walled carbon nanotubes of various diameters with a light beam of a single wavelength of 620 nm under an oxidative environment to obtain single-walled carbon nanotubes of 1.2 nm diameter.