title: The role of surface oxygen in the growth of large single-crystal graphene on copper.
abstract: The growth of high-quality single crystals of graphene by chemical vapor deposition on copper (Cu) has not always achieved control over domain size and morphology, and the results vary from lab to lab under presumably similar growth conditions. We discovered that oxygen (O) on the Cu surface substantially decreased the graphene nucleation density by passivating Cu surface active sites. Control of surface O enabled repeatable growth of centimeter-scale single-crystal graphene domains. Oxygen also accelerated graphene domain growth and shifted the growth kinetics from edge-attachment-limited to diffusion-limited. Correspondingly, the compact graphene domain shapes became dendritic. The electrical quality of the graphene films was equivalent to that of mechanically exfoliated graphene, in spite of being grown in the presence of O.
authors.affiliation: Department of Mechanical Engineering and the Materials Science and Engineering Program, The University of Texas at Austin, Austin, TX 78712, USA.
authors.forename: Yufeng
authors.initials: Y
authors.lastname: Hao
authors.forename: M S
authors.initials: MS
authors.lastname: Bharathi
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Yuanyue
authors.initials: Y
authors.lastname: Liu
authors.forename: Hua
authors.initials: H
authors.lastname: Chen
authors.forename: Shu
authors.initials: S
authors.lastname: Nie
authors.forename: Xiaohan
authors.initials: X
authors.lastname: Wang
authors.forename: Harry
authors.initials: H
authors.lastname: Chou
authors.forename: Cheng
authors.initials: C
authors.lastname: Tan
authors.forename: Babak
authors.initials: B
authors.lastname: Fallahazad
authors.forename: H
authors.initials: H
authors.lastname: Ramanarayan
authors.forename: Carl W
authors.initials: CW
authors.lastname: Magnuson
authors.forename: Emanuel
authors.initials: E
authors.lastname: Tutuc
authors.forename: Boris I
authors.initials: BI
authors.lastname: Yakobson
authors.forename: Kevin F
authors.initials: KF
authors.lastname: McCarty
authors.forename: Yong-Wei
authors.initials: YW
authors.lastname: Zhang
authors.forename: Philip
authors.initials: P
authors.lastname: Kim
authors.forename: James
authors.initials: J
authors.lastname: Hone
authors.forename: Luigi
authors.initials: L
authors.lastname: Colombo
authors.forename: Rodney S
authors.initials: RS
authors.lastname: Ruoff