17:15 〜 17:30
▲ [9p-W521-14] Electrostatic properties of bilayer graphene nanoribbons under an external electric field
キーワード：Field emission, graphene, DFT
In this work, to understand the morphological effects arising from the multi-layered structures on field emission property of graphene, we investigated electrostatic properties of bilayer graphene nanoribbons (GNRs) with different edge morphologies and interlayer stacking. Our calculations show that field emission property for the bilayer GNR depends on the edge shape and the terrace width. Armchair bilayer GNRs have higher field emission current than zigzag ones due to their lower potential barriers. Moreover, the potential barrier for bilayer GNRs decreases with increasing the terrace width irrespective of the edge shape, so that the field emission current from bilayer GNRs increases with increasing the terrace width for both armchair and zigzag edges. In addition, for the edge morphology, we consider the folded zigzag and armchair GNRs, and found that the field emission property is sensitive to the chirality of the folded moiety. Folded zigzag GNRs have lower potential barrier, producing higher field emission current compared with folded armchair GNRs due to the absences of the dangling bond and edge states.