Effects of alkali metal adsorption on the structural and field emission properties of graphene
作者： L. Qiao , C.Q. Qu , H.Z. Zhang , S.S. Yu , X.Y. Hu
DOI: 10.1016/J.DIAMOND.2010.08.003
关键词:
摘要: We systematically investigate the structural and field emission properties of alkali metal atoms adsorbed on graphene using first-principles density-functional theoretical calculations. The calculated results indicate that center hexagonal ring is most stable adsorption site, atom can stay stably by donating their charges to graphene, which in redistribution Mulliken graphene. Also, we explore effects magnitude ionization potential becomes smaller Fermi level increases after adsorption. Moreover, Cs believed be best choice for enhancing properties. mechanism enhanced has been analyzed terms modification density states band structures caused Our findings suggest applied as electron source material, improve its performance, will helpful design functionalized electronic devices.
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