US Patent Number
A method of doping involves soaking single-walled carbon nanotubes in molten iodine. Excess physisorbed iodine may then be removed by annealing.
University of Kentucky Research Foundation, Lexington, Ky.
Eklund, Peter C.; Grigorian, Leonid; Williams, Keith A.; Sumanasekera, Gamini U.; and Fang, Shaoli, "Metallic Nanoscale Fibers from Stable Iodine-Doped Carbon Nanotubes" (2000). Physics and Astronomy Faculty Patents. 3.