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2-D Materials

Borophene could have impressive electronic and physical properties

Theoretical new material bests graphene by some measures, but critics wonder if it can be made

by Sam Lemonick
February 7, 2019 | APPEARED IN VOLUME 97, ISSUE 6

 

09706-scicon4-structure.jpg
Credit: Li-Ming Yang
A theoretical borophene material consisting of 2-D sheets of boron atoms (apricot) stabilized by aluminum atoms (pink).

A computational study has predicted a new 2-D boron material with impressive electronic and physical properties (J. Am. Chem. Soc. 2019, DOI: 10.1021/jacs.8b13075).

Chemists first predicted borophenes—the boron equivalent of graphene—in the 1990s, but the materials weren’t synthesized until 2015. Borophenes share graphene’s sought-after mechanical and electronic properties, but boron’s lower mass makes them lighter. Unfortunately, boron can’t form stable honeycomb structures the way carbon can in graphene.

Li-Ming Yang of Huazhong University of Science and Technology and colleagues predict a new material composed of sheets of borophene sandwiching a layer of tetracoordinate aluminum atoms to stabilize the boron honeycombs. The team’s calculations suggest that this three-layer material would be stiffer than single-layer graphene and would remain stable when heated to nearly 2,100 K. And the researchers say their borophene could be a superconductor at 4.7 K and as high as 30 K when the structure is strained. Such superconducting properties could be useful in electronics, transportation, or energy storage.

Those superconducting values may be optimistic, says Boris Yakobson, a computational chemist at Rice University. He points out that under different assumptions, models suggest lower temperatures. He also thinks borophene wouldn’t survive the strain needed to improve its superconducting temperature. He and others say the biggest assumption is that this material can be made. But Alexander I. Boldyrev, a computational chemist at Utah State University who has collaborated with this group before, says they’ve successfully synthesized other materials they’ve predicted.

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