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Synthesis of borophenes: Anisotropic, two-dimensional boron polymorphs

Andrew J. MannixCenter for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Building 440, Argonne, IL 60439, USAXiang‐Feng ZhouDepartment of Geosciences, Center for Materials by Design, and Institute for Advanced Computational Science, Stony Brook University, Stony Brook, NY 11794, USABrian KiralyCenter for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Building 440, Argonne, IL 60439, USAJoshua D. WoodDepartment of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208, USADiego AlducinDepartment of Physics, University of Texas San Antonio, San Antonio, TX 78249, USABenjamin D. MyersDepartment of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208, USAXiaolong LiuApplied Physics Graduate Program, Northwestern University, 2220 Campus Drive, Evanston, IL 60208, USABrandon FisherCenter for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Building 440, Argonne, IL 60439, USAUlises SantiagoDepartment of Physics, University of Texas San Antonio, San Antonio, TX 78249, USAJeffrey R. GuestCenter for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Building 440, Argonne, IL 60439, USAMiguel José YacamánDepartment of Physics, University of Texas San Antonio, San Antonio, TX 78249, USAArturo PonceDepartment of Physics, University of Texas San Antonio, San Antonio, TX 78249, USAArtem R. OganovDepartment of Geosciences, Center for Materials by Design, and Institute for Advanced Computational Science, Stony Brook University, Stony Brook, NY 11794, USAMark C. HersamApplied Physics Graduate Program, Northwestern University, 2220 Campus Drive, Evanston, IL 60208, USANathan P. GuisingerCenter for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Building 440, Argonne, IL 60439, USA

2015en

ABI

Annotatsiya

At the atomic-cluster scale, pure boron is markedly similar to carbon, forming simple planar molecules and cage-like fullerenes. Theoretical studies predict that two-dimensional (2D) boron sheets will adopt an atomic configuration similar to that of boron atomic clusters. We synthesized atomically thin, crystalline 2D boron sheets (i.e., borophene) on silver surfaces under ultrahigh-vacuum conditions. Atomic-scale characterization, supported by theoretical calculations, revealed structures reminiscent of fused boron clusters with multiple scales of anisotropic, out-of-plane buckling. Unlike bulk boron allotropes, borophene shows metallic characteristics that are consistent with predictions of a highly anisotropic, 2D metal.

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DOI: 10.1126/science.aad1080

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