title: Effects of the electric field on the properties of ZnO-graphene composites: a density functional theory study.
abstract: In this work, the effects of the electric field on the properties of ZnO-graphene composites were theoretically studied using density functional theory calculations. Three types of ZnO-graphene composites including composites of pristine graphene, graphene with defects as well as graphene oxide and a ZnO bilayer were studied. We calculated and analyzed the binding energies, charge transfer, band structures and work functions of the above composites under the external electric fields. The DFT calculation results demonstrate that the binding energies are sensitive to the electric field, and increasing the external electric field gives rise to stronger binding energies. The extent of charge transfer is correlated with the magnitude of the external electric field, but the band gaps are hardly affected by the external electric field. The work functions vary depending on the different structures of the composites and surface sides, and they are also tunable by the external electric field.
authors.affiliation: State Key Laboratory of Applied Organic Chemistry and Department of Chemistry, Lanzhou University, Lanzhou 730000, China. xjyao@lzu.edu.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Geng
authors.forename: Xuefei
authors.initials: X
authors.lastname: Zhao
authors.forename: Wenyan
authors.initials: W
authors.lastname: Zan
authors.forename: Huanxiang
authors.initials: H
authors.lastname: Liu
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Yao
mesh_terms: D004560:Electricity; D006108:Graphite / Q000737:chemistry*; D008962:Models, Theoretical; D053761:Nanocomposites / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry; D013499:Surface Properties; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D010087:Oxides; D006108:Graphite; D015034:Zinc Oxide