title: Vapor trapping growth of single-crystalline graphene flowers: synthesis, morphology, and electronic properties.
abstract: We report a vapor trapping method for the growth of large-grain, single-crystalline graphene flowers with grain size up to 100 μm. Controlled growth of graphene flowers with four lobes and six lobes has been achieved by varying the growth pressure and the methane to hydrogen ratio. Surprisingly, electron backscatter diffraction study revealed that the graphene morphology had little correlation with the crystalline orientation of underlying copper substrate. Field effect transistors were fabricated based on graphene flowers and the fitted device mobility could achieve ∼4200 cm(2) V(-1) s(-1) on Si/SiO(2) and ∼20 000 cm(2) V(-1 )s(-1) on hexagonal boron nitride (h-BN). Our vapor trapping method provides a viable way for large-grain single-crystalline graphene synthesis for potential high-performance graphene-based electronics.
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, United States.
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
authors.forename: Luyao
authors.initials: L
authors.lastname: Zhang
authors.forename: Pyojae
authors.initials: P
authors.lastname: Kim
authors.forename: Mingyuan
authors.initials: M
authors.lastname: Ge
authors.forename: Zhen
authors.initials: Z
authors.lastname: Li
authors.forename: Chongwu
authors.initials: C
authors.lastname: Zhou
mesh_terms: D003460:Crystallization / Q000379:methods*; D004553:Electric Conductivity; D005740:Gases / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D005740:Gases; D046911:Macromolecular Substances; D006108:Graphite