▎ 摘　　要

Calculations based on density-functional theory are used to investigate the electronic properties of graphene nanoribbons (GNRs) with hydrogen-passivated armchair-shaped edges. It is found that their density of states (DOS) is non-symmetric, and that small splittings of some peaks of DOS occur. Also, it is confirmed that their energy band gaps depend on ribbon widths, and show a sawtooth-like shape, which is in a good agreement with others' previous results. Analysing the frontier bonding structures and the density of electrons, we can determine that both ribbon width and edge play a key role in the electronic properties of GNRs with hydrogen-passivated armchair-shaped edges.