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Honeycomb Boron on Al(111) : From the Concept of Borophene to the Two-Dimensional Boride

Preobrajenski, Alexei B. LU ; Lyalin, Andrey ; Taketsugu, Tetsuya ; Vinogradov, Nikolay A. LU orcid and Vinogradov, Alexander S. (2021) In ACS Nano 15(9). p.15153-15165
Abstract

A great variety of two-dimensional (2D) boron allotropes (borophenes) were extensively studied in the past decade in the quest for graphene-like materials with potential for advanced technological applications. Among them, the 2D honeycomb boron is of specific interest as a structural analogue of graphene. Recently it has been synthesized on the Al(111) substrate; however it remains unknown to what extent does honeycomb boron behave like graphene. Here we elucidate the structural and electronic properties of this unusual 2D material with a combination of core-level X-ray spectroscopies, scanning tunneling microscopy, and DFT calculations. We demonstrate that in contrast to graphene on lattice-mismatched metal surfaces, honeycomb boron... (More)

A great variety of two-dimensional (2D) boron allotropes (borophenes) were extensively studied in the past decade in the quest for graphene-like materials with potential for advanced technological applications. Among them, the 2D honeycomb boron is of specific interest as a structural analogue of graphene. Recently it has been synthesized on the Al(111) substrate; however it remains unknown to what extent does honeycomb boron behave like graphene. Here we elucidate the structural and electronic properties of this unusual 2D material with a combination of core-level X-ray spectroscopies, scanning tunneling microscopy, and DFT calculations. We demonstrate that in contrast to graphene on lattice-mismatched metal surfaces, honeycomb boron cannot wiggle like a blanket on Al(111), but rather induces reconstruction of the top metal layer, forming a stoichiometric AlB2 sheet on top of Al. Our conclusions from theoretical modeling are fully supported by X-ray absorption spectra showing strong similarity in the electronic structure of honeycomb boron on Al(111) and thick AlB2 films. On the other hand, a clear separation of the electronic states of the honeycomb boron into π- and σ-subsystems indicates an essentially 2D nature of the electronic system in both one-layer AlB2 and bulk AlB2.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
2D materials, aluminum boride, borophene, DFT, NEXAFS, STM, XPS
in
ACS Nano
volume
15
issue
9
pages
15153 - 15165
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85114620021
  • pmid:34460239
ISSN
1936-0851
DOI
10.1021/acsnano.1c05603
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2021 The Authors. Published by American Chemical Society.
id
8badd9ee-c455-4ab5-9fe2-430319dfd91b
date added to LUP
2021-10-18 15:35:23
date last changed
2024-06-16 20:56:50
@article{8badd9ee-c455-4ab5-9fe2-430319dfd91b,
  abstract     = {{<p>A great variety of two-dimensional (2D) boron allotropes (borophenes) were extensively studied in the past decade in the quest for graphene-like materials with potential for advanced technological applications. Among them, the 2D honeycomb boron is of specific interest as a structural analogue of graphene. Recently it has been synthesized on the Al(111) substrate; however it remains unknown to what extent does honeycomb boron behave like graphene. Here we elucidate the structural and electronic properties of this unusual 2D material with a combination of core-level X-ray spectroscopies, scanning tunneling microscopy, and DFT calculations. We demonstrate that in contrast to graphene on lattice-mismatched metal surfaces, honeycomb boron cannot wiggle like a blanket on Al(111), but rather induces reconstruction of the top metal layer, forming a stoichiometric AlB2 sheet on top of Al. Our conclusions from theoretical modeling are fully supported by X-ray absorption spectra showing strong similarity in the electronic structure of honeycomb boron on Al(111) and thick AlB2 films. On the other hand, a clear separation of the electronic states of the honeycomb boron into π- and σ-subsystems indicates an essentially 2D nature of the electronic system in both one-layer AlB2 and bulk AlB2.</p>}},
  author       = {{Preobrajenski, Alexei B. and Lyalin, Andrey and Taketsugu, Tetsuya and Vinogradov, Nikolay A. and Vinogradov, Alexander S.}},
  issn         = {{1936-0851}},
  keywords     = {{2D materials; aluminum boride; borophene; DFT; NEXAFS; STM; XPS}},
  language     = {{eng}},
  number       = {{9}},
  pages        = {{15153--15165}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{ACS Nano}},
  title        = {{Honeycomb Boron on Al(111) : From the Concept of Borophene to the Two-Dimensional Boride}},
  url          = {{http://dx.doi.org/10.1021/acsnano.1c05603}},
  doi          = {{10.1021/acsnano.1c05603}},
  volume       = {{15}},
  year         = {{2021}},
}