ABSTRACT
Few-layer graphene nanoribbons have been synthesized by cutting graphene, unzipping multi-walled carbon nanotubes, and chemical vapor deposition. The bilayer zigzag graphene nanoribbons are suitable in understanding the combined effects due to the stacking configuration, edge-edge interaction, finite-size confinement, intralayer and interlayer spin arrangements. Bilayer zigzag graphene nanoribbons, with hydrogen passivation, are chosen to investigate the effects due to the stacking configurations, the van der Waals interactions, and the spin distributions. The cohesive energy, the energy difference between the total energy of bilayer graphene nanoribbons and that of two decoupled subsystems, can identify the relatively stable stacking configuration. The combined effects are responsible for the shift process of bilayer zigzag graphene nanoribbon. The relative stable configuration is determined by the strong competition among the stacking configurations, the edge-edge interactions and the spin arrangements. The distinct dimensions can greatly diversify the essential properties, being illustrated by the significant differences between bilayer 2D graphene and 1D graphene nanoribbon.
