▎ 摘　　要

We have used density functional theory to study the electronic properties of O-doped porous graphene and O-doped biphenylene carbon. The porous graphene is an insulator, while the biphenylene carbon shows semiconducting property. It was found that oxygen doping has a considerable effect on the electronic properties of porous graphene and biphenylene carbon sheets. These sheets become n-type semiconductors in the presence of oxygen impurity. The energy band gap was decreased due to the presence of oxygen impurity.