The results of Raman and field emission studies of the structural and physical features of iodine intercalated bundles of single-walled carbon nanotubes (SWNTs) were presented The periodicity of hexagonally closest-packed pristine nanotubes was destroyed by the intercalation of iodine molecules in interstitial sites of carbon nanotube bundles. The Raman spectra obtained using a 647.1nm line of Kr-ion laser indicate that I2 intercalation does affect the electronic state of metallic SWNTs of small diameters of ~1.26 nm changing into the insulating state. The turn-on electric fields obtained from the I-V measurements for iodine intercalated SWNTs and pristine SWNTs were 2.43 and 3.41V/μm, respectively, and iodine intercalated SWNTs show higher field emission than did pristine SWNTs.

Raman Scattering Study of Iodine Intercalated Bundles of Single-Wall Carbon Nanotubes. V.M.Nguyen, S.J.Kim, I.S.Yang: Advances in Natural Sciences - Nanoscience and Nanotechnology, 2011, 2[2], 025006