  Growing graphene nanoribbons from small organic molecules encapsulated in
carbon nanotubes can result in products with uniform width and chirality. We
propose a method based on encapsulation of 1,2,4-trichlorobenzene from the
liquid phase and subsequent annealing. This procedure results in graphene
nanoribbons several tens of nanometers long. The presence of nanoribbons was
proven by Raman spectra both on macroscopic samples and on the nanoscale by
tip-enhanced Raman scattering and high-resolution transmission electron
microscopic images.

Materials Science