Current-voltage characteristics of composite graphene-nanotube films with irregular arrangement of nanotubes

Topological models of the graphene/CNT hybrid composite have been constructed, which are tubes that lie irregularly between graphene monolayers and parallel to them, covalently linked to graphene. The distance between the tubes was measured in hexagons (H$_1$ and H$_2$) of graphene between the ribs involved in the formation of covalent bonds. It was shown that only those films that are based on zigzag ($n$, 0) tubes with an even number n are energetically stable. According to our research, the most stable structure is a film with a tube (10.0) and with an arrangement step of 6/8. It was found that the energy gap is present in the band structure of all the studied film models and is in the range of 0.41 – 0.73 eV.