Nav: Home

Boron can form a purely honeycomb, graphene-like 2-D structure

March 14, 2018

Seeking for low-dimensional boron allotropes has attracted considerable interest in the past decades and tremendous theoretical works predict the existence of monolayer boron. As boron has only three valence electrons, the electron deficiency makes a honeycomb lattice of boron energetically unstable. Instead, a triangular lattice with periodic holes was predicted to be more stable. In 2015, Prof. Wu has led a research team at Institute of Physics, Chinese Academy of Sciences, and successfully synthesized 2D borophene sheet on silver surface, which is exhibiting the predicted triangular lattice with different arrangements of hexagonal holes.

An intriguing question is whether it is possible to prepare a borophene monolayer with a pure honeycomb lattice. Honeycomb borophene will naturally host Dirac fermions and thus intriguing electronic properties resembling other group IV elemental 2D materials. Additionally, a honeycomb 2D boron lattice may enable the superconductivity behavior. Since in the well-known high Tc superconductor, MgB2, the crystal structure consists of boron planes with intercalated Mg layers, where the boron plane has a pure honeycomb structure like graphene. It is remarkable that in MgB2, superconductivity occurs in the boron planes, while the Mg atoms serves as electron donors.

Recently, the research team led by Prof. Wu reported the successful preparation of a purely honeycomb, graphene-like borophene, by using an Al(1 1 1) surface as the substrate and molecular beam epitaxy (MBE) growth in ultrahigh vacuum. Scanning tunneling microscopy (STM) images reveal perfect monolayer borophene with planar, non-buckled honeycomb lattice similar as graphene. Theoretical calculations show that the honeycomb borophene on Al(1 1 1) is energetically stable. Remarkably, nearly one electron charge is transferred to each boron atom from the Al(1 1 1) substrate and stabilizes the honeycomb borophene structure. This work vividly demonstrated that one can manipulate the borophene lattice by controlling the charge transfer between the substrate and the borophene. And the honeycomb borophene provides attractive possibility to construct boron-based atomic layers with unique electronic properties such as Dirac states, as well as to control superconductivity in boron-based compounds.
This work was supported by the National Key Research and Development Program (2016YFA0300904 and 2016YFA0202301), the National Natural Science Foundation of China (11334011, 11674366 and 11674368), and the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB07010200 and XDPB06).

See the article:

Wenbin Li, Longjuan Kong, Caiyun Chen, Jian Gou, Shaoxiang Sheng, Weifeng Zhang, Hui Li, Lan Chen, Peng Cheng, Kehui Wu, Experimental Realization of Honeycomb Borophene, Science Bulletin, 2018, Vol.63, No. 5: 282-286

Science China Press

Related Boron Articles:

A novel recipe for efficiently removing intrinsic defects from hard crystals
A team of researchers from Osaka University, the Institute for High Pressure Physics and the Institute for Nuclear Research of Russian Academy of Sciences (Russia), and TU Dresden (Germany), discovered an effective method for removing lattice defects from crystals.
Can't get thinner than this: synthesis of atomically flat boron sheets
Scientists at Tokyo Institute of Technology (Tokyo Tech) find a simple method for producing atomically thin layers of oxidized borophene, a promising 2D boron-based nanomaterial that could serve in a variety of fields.
Experiments and calculations allow examination of boron's complicated dance
In a study that combines groundbreaking experimental work and theoretical calculations, researchers at the US Department of Energy's (DOE) Argonne National Laboratory, in collaboration with scientists in Germany and Poland, have determined the nuclear geometry of two isotopes of boron.
High thermal conductivity of new material will create energy efficient devices
Researchers at the University of Bristol have successfully demonstrated the high thermal conductivity of a new material, paving the way for safer and more efficient electronic devices -- including mobile phones, radars and even electric cars.
Nanomaterials mimicking natural enzymes with superior catalytic activity and selectivity
A KAIST research team doped nitrogen and boron into graphene to selectively increase peroxidase-like activity and succeeded in synthesizing a peroxidase-mimicking nanozyme with a low cost and superior catalytic activity.
More Boron News and Boron Current Events

Best Science Podcasts 2019

We have hand picked the best science podcasts for 2019. Sit back and enjoy new science podcasts updated daily from your favorite science news services and scientists.
Now Playing: TED Radio Hour

Erasing The Stigma
Many of us either cope with mental illness or know someone who does. But we still have a hard time talking about it. This hour, TED speakers explore ways to push past — and even erase — the stigma. Guests include musician and comedian Jordan Raskopoulos, neuroscientist and psychiatrist Thomas Insel, psychiatrist Dixon Chibanda, anxiety and depression researcher Olivia Remes, and entrepreneur Sangu Delle.
Now Playing: Science for the People

#537 Science Journalism, Hold the Hype
Everyone's seen a piece of science getting over-exaggerated in the media. Most people would be quick to blame journalists and big media for getting in wrong. In many cases, you'd be right. But there's other sources of hype in science journalism. and one of them can be found in the humble, and little-known press release. We're talking with Chris Chambers about doing science about science journalism, and where the hype creeps in. Related links: The association between exaggeration in health related science news and academic press releases: retrospective observational study Claims of causality in health news: a randomised trial This...