Electronic structure of a borophene layer in rare-earth aluminum/chromium boride and its hydrogenated derivative borophane

Niibe, Masahito; Cameau, Mathis; Cuong, Nguyen Thanh; Sunday, Omeji Ilemona; Zhang, Xiaoni; Tsujikawa, Yuki; Okada, Susumu; Kondo, Takahiro; Matsuda, Ichiro

doi:10.1103/physrevmaterials.5.084007

Cited by 22 publications

(34 citation statements)

References 53 publications

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“…The electronic structures of HB sheets have also been studied by X-ray spectroscopy experiments [ 37 , 41 ]. Both of the hexagonal and (5–7)-

HB sheets have been confirmed to be semimetallic at least with power samples.…”

Section: Experiments and Applicationsmentioning

confidence: 99%

“…The calculated

and

bands for the (5–7)-

and (5–7)-

HB sheets are also shown for comparison. It is of note that the SXE and SXA spectra indicate the dipole transition between 2p and 1s states, reflecting the occupied valence band and unoccupied conduction band, respectively, [ 41 , 49 ], as shown in Figure 8 . One can find that the spectroscopy results agree well with calculated bands, especially with the

1 type.…”

Section: Experiments and Applicationsmentioning

confidence: 99%

“…( b ) BZ of the (5–7)-

-borophene. ( c ) Total and partial density of state of (5–7)-

-borophene obtained by the first-principles calculation (adapted from [ 38 , 41 ]).…”

Section: Figurementioning

confidence: 99%

“…( a ) Schematic picture of the soft X-ray emission and absorption (SXE and SXA) spectroscopy. ( b ) Spectroscopy data of the (5–7)-

HB sheet and calculated

and

bands for the (5–7)-

and (5–7)-

HB sheets (adapted from [ 41 ]).…”

Section: Figurementioning

confidence: 99%

“…The obtained monolayer hydrogenated boron (HB) sheet, or “borophane”, has been attracting attention as a new 2D material [ 37 , 38 , 39 , 40 ]. Because the HB sheets are synthesized from boron frames in a 3D crystal material, another type of HB with a different boron frame has also been synthesized [ 41 ]. Not only a variety of borophene systems synthesized on metal substrates [ 42 , 43 , 44 , 45 , 46 , 47 ], but the free-standing HB sheets are also an important platform to study the 2D boron materials.…”

Section: Introductionmentioning

confidence: 99%

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Electronic Structures of Polymorphic Layers of Borophane

2022

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The search for free-standing 2D materials has been one of the most important subjects in the field of studies on 2D materials and their applications. Recently, a free-standing monolayer of hydrogenated boron (HB) sheet has been synthesized by hydrogenation of borophene. The HB sheet is also called borophane, and its application is actively studied in many aspects. Here, we review recent studies on the electronic structures of polymorphic sheets of borophane. A hydrogenated boron sheet with a hexagonal boron frame was shown to have a semimetallic electronic structure by experimental and theoretical analyses. A tight-binding model that reproduces the electronic structure was given and it allows easy estimation of the properties of the material. Hydrogenated boron sheets with more complicated nonsymmorphic boron frames were also analyzed. Using the symmetry restrictions from the nonsymmorphic symmetry and the filling factor of hydrogenated boron sheets, the existence of a Dirac nodal line was suggested. These studies provide basic insights for research on and device applications of hydrogenated boron sheets.

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“…The electronic structures of HB sheets have also been studied by X-ray spectroscopy experiments [ 37 , 41 ]. Both of the hexagonal and (5–7)-

HB sheets have been confirmed to be semimetallic at least with power samples.…”

Section: Experiments and Applicationsmentioning

confidence: 99%

“…The calculated

and

bands for the (5–7)-

and (5–7)-

1 type.…”

Section: Experiments and Applicationsmentioning

confidence: 99%

“…( b ) BZ of the (5–7)-

-borophene. ( c ) Total and partial density of state of (5–7)-

-borophene obtained by the first-principles calculation (adapted from [ 38 , 41 ]).…”

Section: Figurementioning

confidence: 99%

“…( a ) Schematic picture of the soft X-ray emission and absorption (SXE and SXA) spectroscopy. ( b ) Spectroscopy data of the (5–7)-

HB sheet and calculated

and

bands for the (5–7)-

and (5–7)-

HB sheets (adapted from [ 41 ]).…”

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electronic Structures of Polymorphic Layers of Borophane

2022

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Controlling Photoinduced H₂ Release from Freestanding Borophane Sheets Under UV Irradiation by Tuning B–H Bonds

Hikichi

Takeshita

Noguchi

et al. 2023

Adv Materials Inter

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Hydrogen boride (HB), a freestanding 2D hydrogenated‐borophene (borophane) polymorph, is synthesized via ion exchange. HB sheets with a B/H atomic ratio of 1.0 are confirmed to contain three‐center–two‐electron B–H–B bonds and two‐center–two‐electron terminal B–H bonds. The optical properties of HB sheets are expected to be tunable by changing the BHB/BH bond ratio, which alters the electronic structure of HB sheets; however, this is not yet achieved. This study demonstrates that controlling the BHB/BH bond ratio in the HB sheets is possible without altering the hydrogen content by adjusting the volume of ion‐exchange resin during synthesis, thus enabling the tuning of the photoinduced H2 release under UV irradiation. Furthermore, the fluorescence intensity correlates with the absorbance ratio of the BHB and BH vibrational modes. Increasing the BHB/BH bond ratio enhances the luminescence intensity, whereas reducing it enhances the photoinduced H2 release rate under UV irradiation. The ability to control the BHB/BH bond ratio of HB sheets provides new avenues for optimizing their properties for various applications, including hydrogen storage and photocatalysis.

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Linear X-Ray Spectroscopy

Matsuda

2023

Springer Series in Optical Sciences

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Electronic structure of a borophene layer in rare-earth aluminum/chromium boride and its hydrogenated derivative borophane

Cited by 22 publications

References 53 publications

Electronic Structures of Polymorphic Layers of Borophane

Electronic Structures of Polymorphic Layers of Borophane

Controlling Photoinduced H₂ Release from Freestanding Borophane Sheets Under UV Irradiation by Tuning B–H Bonds

Linear X-Ray Spectroscopy

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Electronic structure of a borophene layer in rare-earth aluminum/chromium boride and its hydrogenated derivative borophane

Cited by 22 publications

References 53 publications

Electronic Structures of Polymorphic Layers of Borophane

Electronic Structures of Polymorphic Layers of Borophane

Controlling Photoinduced H2 Release from Freestanding Borophane Sheets Under UV Irradiation by Tuning B–H Bonds

Linear X-Ray Spectroscopy

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Product

Resources

About

Controlling Photoinduced H₂ Release from Freestanding Borophane Sheets Under UV Irradiation by Tuning B–H Bonds