Synthesis of borophenes: Anisotropic, two-dimensional boron polymorphs

ROM 2016-02
Author: E-mail: nguisinger@anl.gov (N.P.G.); m-hersam@northwestern.edu (M.C.H.); artem.oganov@stonybrook.edu (A.R.O.)
Publication: sciencemag.org / 18 DECEMBER 2015 • VOL 350 • ISSUE 6267 • Page 1513-1516
Instrument: VT SPM

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.

Authors: 
Andrew J. Mannix,1,2 Xiang-Feng Zhou,3,4 Brian Kiraly,1,2 Joshua D. Wood,2 Diego Alducin,5 Benjamin D. Myers,2,6 Xiaolong Liu,7 Brandon L. Fisher,1 Ulises Santiago,5 Jeffrey R. Guest,1 Miguel Jose Yacaman,5 Arturo Ponce,5 Artem R. Oganov,8,9,3* Mark C. Hersam,2,7,10* Nathan P. Guisinger1*

Institutes: 

1Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Building 440, Argonne, IL 60439, USA.
2Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208, USA.
3Department of Geosciences, Center for Materials by Design, and Institute for Advanced Computational Science, Stony Brook University, Stony Brook, NY 11794, USA.
4School of Physics, Nankai University, Tianjin 300071, China.
5Department of Physics, University of Texas San Antonio, San Antonio, TX 78249, USA.
6NUANCE Center, Northwestern University, 2220 Campus Drive, Evanston, IL 60208, USA.
7Applied Physics Graduate Program, Northwestern University, 2220 Campus Drive, Evanston, IL 60208, USA.
8Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, 5 Nobel Street, Moscow 143026, Russia.
9Moscow Institute of Physics and Technology, 9 Institutskiy Lane, Dolgoprudny City, Moscow Region, 141700, Russia. 10Department of Chemistry, Northwestern University, 2220 Campus Drive, Evanston, IL 60208, USA.

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