1D Iodine Formed Inside a Pre-Oriented Matrix of Carbon Nanotubes

1D iodine nanostructures encapsulated inside a matrix of pre-aligned single-wall carbon nanotubes were synthesized by sublimation of a crystalline iodine phase. Liquid phase self-assembly method has been used for alignment of nanotube thin film. Since the orientation of the iodine structure was naturally determined by the orientation of the host nanotube matrix, the anisotropic optical and electronic properties of the inner structure at the macroscopic scale were obtained. Polarized Raman spectroscopy measurements confirmed the presence of 1D polyiodide species oriented along the axis of nanotubes. The DFT calculations of polarized Raman spectra of polyiodide chains shown that the polarization dependences of the longitudinal modes for chains oriented along the nanotube axis and for helical twisted chains were significantly different.