▎ 摘　　要

Using the first-principles method based on density functional theory, the electronic properties of various one-dimensional graphene quantum-dot arrays (1D GQDAs) are systematically studied. It shows that arrays present semiconducting behaviors when their edge structure is armchair-type, however, if their edge structure is zigzag-type, arrays are either metallic or semiconducting depending on the type of edge units: AA-type or AB-type. Punching nanoholes in quantum-dots would lead to an increase of the band gap for semiconducting arrays, but does not change a metallicity significantly for metallic arrays. Moreover, we find that the band gap of 1D semiconducting GQDAs decreases oscillatorily with size increasing, which means that the bandgap size is closely related to the quantum confinement and size effects. Our studies show that constructing various kinds of 1D GQDAs can effectively regulate the electronic behaviors of the graphene structure and obtain abundant electrical properties. (C) 2014 Elsevier B.V. All rights reserved.