▎ 摘　　要

In this article, we report band structure studies of zigzag graphene nanoribbons (ZGNRs) on introducing defects (sp(3) hybridized carbon atoms) in different concentrations at edges by varying the ratio of sp(3) to sp(2) hybridized carbon atoms. On the basis of theoretical analyses, bandgap values of ZGNRs are found to be strongly dependent on the relative arrangement of sp(3) to sp(2) hybridized carbon atoms at the edges for a defect concentration; so the findings would greatly help in understanding the bandgap of nanoribbons for their electronic applications. Published by AIP Publishing.