Importance of doping site of B, N, and O in tuning electronic structure of graphynes

Density functional theory calculations were carried out to study how the position of single-atom doping affects the electronic properties of three graphyne models. We found that the position of the dopant (B, N, or O) plays an important role in tuning the electronic structure of graphynes. For alpha-graphyne, the electronic structure is significantly different for different positions of B and O doping. For beta-graphyne, the electronic structure depends remarkably on the doping position for O doping, but not much for B and N doping, whereas for gamma-graphyne, it depends on the position for B and O doping, but not for N doping. (C) 2016 Elsevier Ltd. All rights reserved.