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Synthesis of borophenes: Anisotropic, two-dimensional boron polymorphs.

Andrew J Mannix¹, Xiang-Feng Zhou², Brian Kiraly¹

¹Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Building 440, Argonne, IL 60439, USA. Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208, USA.

Science (New York, N.Y.)

|December 19, 2015

Summary

Researchers synthesized two-dimensional boron sheets, or borophene, on silver surfaces. This novel material exhibits metallic properties and unique structural characteristics, unlike traditional boron allotropes.

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Pure boron exhibits atomic structures analogous to carbon, forming planar molecules and fullerenes.
Theoretical models predict two-dimensional (2D) boron sheets (borophene) will mirror these cluster configurations.
Bulk boron allotropes possess distinct structural and electronic properties.

Purpose of the Study:

To synthesize and characterize atomically thin, crystalline 2D boron sheets (borophene).
To investigate the atomic structure and electronic properties of synthesized borophene.
To compare the properties of borophene with theoretical predictions and bulk boron.

Main Methods:

Synthesis of 2D boron sheets on silver substrates under ultrahigh-vacuum conditions.
Atomic-scale characterization techniques (e.g., microscopy).
Theoretical calculations to support experimental findings.

Main Results:

Successful synthesis of atomically thin, crystalline borophene.
Observed structures resemble fused boron clusters with anisotropic, out-of-plane buckling.
Demonstrated metallic characteristics, consistent with predictions of a 2D metal.

Conclusions:

Borophene can be synthesized as a stable 2D material.
Borophene exhibits unique structural features and metallic properties distinct from bulk boron.
The findings validate theoretical predictions for 2D boron.