Nanotube Structure Revealed by High‐Resolution X‐ray Diffraction

High‐resolution X‐ray diffraction of high‐purity multiwall carbon nanotubes has been performed and unusual diffraction physics was observed. Fourier analysis confirms that the multiwall nanotubes are made of concentric cylinders and that there is a non‐uniform distribution of inner tube diameter. The interference effect discussed in this paper is unique for concentric tubes and in contrast to nanotubes that are scroll‐like or made up of irregular grains.