Preparation and Characterization of Iodine-doped Multi-wall Carbon Nanotubes

Multi‐wall carbon nanotubes (MWCNTs) were synthesized by thermal chemical vapor deposition (CVD) and were intercalated with iodine at several different temperatures. Iodine doping was achieved by immersing the nanotubes in molten iodine. The sample produced was characterized by means of infrared IR as a point to the presence of covalent C‐I bonds in the sample with retention of the sp2‐hybridizated carbon atoms. For all samples doped at different temperatures, the C‐I bonding happen to occur based on IR spectra which was indicated by peaks around 600–650 cm−1. X‐ray diffraction (XRD) characterization was used to study on the crystallinity of the undoped and iodine‐doped MWCNTs. It was shown that, iodine‐doping of the MWCNTs gives significant changes in the XRD spectra compared to the undoped MWCNTs. With various doping temperature, the XRD spectra shows the different crystallinity.