ABSTRACT
The open edges of graphene nanoribbons, with the dangling bonds, are available in modulating the essential properties by the adatom decorations. The strong chemical bondings between adatoms and carbons might reconstruct the edge structures and thus dramatically change the electronic properties. The N-decorated graphene nanoribbon presents a periodic heptagonpentagon edge structure, accompanied with the regular hexagons. The distinct adatom decorations could dramatically alter the width dependence of energy gap, since the band-edge states near EF are sensitive to the edge passivation. The low-lying energy bands of a highly curved nanoribbon present the composite features related to a H-terminated flat nanoribbon and a carbon nanotube. Although the origins of linear bands might be somewhat different, the type-II systems possess the almost same peculiar feature as the armchair carbon nanotubes: the metallike electrical conductivity required for use as 1D nanowires, being a promising feature to apply in future nanoelectronics.
