Modulation of Photocatalytic Properties by Strain in 2D BiOBr Nanosheets

Feng, Haifeng; Xu, Zhifeng; Wang, Liang; Yu, Youxing; Mitchell, David R. G.; Cui, Dandan; Xu, Xun; Shi, Ji; Sannomiya, Takumi; Du, Yi; Hao, Weichang; Dou, Shi Xue

doi:10.1021/acsami.5b08904

Cited by 138 publications

(61 citation statements)

References 25 publications

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“…However, their UV detection performance especially for the DUV probing are still required to be comprehensively improved. Ternary BiOBr with wide bandgap (2.5–2.9 eV) and high electron mobility is an excellent light‐sensitive material, which has been widely used for photocatalysis 27–29. The layered tetragonal matlockite structure of BiOBr is composed of [Bi 2 O 2 ] 2+ layer interleaved by double layer of Br − ions.…”

Section: Figurementioning

confidence: 99%

“…Strong light‐absorbing ability, environmental friendliness, high conductivity, and chemical stability originated from the unique structure enable it with great potential for optoelectronic devices 29,30. However, in the past reports, disordered morphology of thick BiOBr nanoflakes synthesized by liquid hydrothermal method cannot be used for micro–nano devices due to incompatibility with semiconductor processing technology 27–30. The low crystalline quality, unavoidable surface contamination, and numerous oxygen defects of hydrothermal BiOBr nanoflakes also hinder the development in optoelectronic devices 29–30.…”

Section: Figurementioning

confidence: 99%

“…The low crystalline quality, unavoidable surface contamination, and numerous oxygen defects of hydrothermal BiOBr nanoflakes also hinder the development in optoelectronic devices 29–30. In addition, relatively narrow bandgap was often obtained for previously reported BiOBr due to the too thick nanosheets and tensile strain, which is also inappropriate to be employed for UV detection applications 27,28. Therefore, till now, fabrication of BiOBr nanostructures with wide bandgap above 3.0 eV and high crystallinity has never been reported for highly sensitive UV especially DUV detection device.…”

Section: Figurementioning

confidence: 99%

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Large‐Scale Ultrathin 2D Wide‐Bandgap BiOBr Nanoflakes for Gate‐Controlled Deep‐Ultraviolet Phototransistors

et al. 2020

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Ternary two‐dimensional (2D) semiconductors with controllable wide bandgap, high ultraviolet (UV) absorption coefficient, and critical tuning freedom degree of stoichiometry variation have a great application prospect for UV detection. However, as‐reported ternary 2D semiconductors often possess a bandgap below 3.0 eV, which must be further enlarged to achieve comprehensively improved UV, especially deep‐UV (DUV), detection capacity. Herein, sub‐one‐unit‐cell 2D monolayer BiOBr nanoflakes (≈0.57 nm) with a large size of 70 µm are synthesized for high‐performance DUV detection due to the large bandgap of 3.69 eV. Phototransistors based on the 2D ultrathin BiOBr nanoflakes deliver remarkable DUV detection performance including ultrahigh photoresponsivity (Rλ, 12739.13 A W−1), ultrahigh external quantum efficiency (EQE, 6.46 × 106%), and excellent detectivity (D*, 8.37 × 1012 Jones) at 245 nm with a gate voltage (Vg) of 35 V attributed to the photogating effects. The ultrafast response (τrise = 102 µs) can be achieved by utilizing photoconduction effects at Vg of −40 V. The combination of photocurrent generation mechanisms for BiOBr‐based phototransistors controlled by Vg can pave a way for designing novel 2D optoelectronic materials to achieve optimal device performance.

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Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Large‐Scale Ultrathin 2D Wide‐Bandgap BiOBr Nanoflakes for Gate‐Controlled Deep‐Ultraviolet Phototransistors

et al. 2020

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“…Moreover, the in-plane wrinkles of the nanosheets can be distinctly observed, which might be attributed to the existence of inner strain in the BiOBr x I 1−x structure. The inner strain can change the band structure and facilitate the charge separation, accordingly improving the photocatalytic activity of BiOX [44]. …”

Section: Crystal Phase and Morphology Of Biobr X I 1−x Solid Solutionsmentioning

confidence: 99%

Structure-Dependent Photocatalytic Performance of BiOBrxI1−x Nanoplate Solid Solutions

Han

et al. 2017

Catalysts

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BiOX x Y 1−x (X, Y = Cl, Br, and I) solid solutions have been regarded as promising photocatalysts attributed to their unique layered structure, tunable band structure, and chemical and optical stability. In this study, BiOBr x I 1−x nanoplate solid solutions with a high exposure of {001} crystal facets were prepared by a facile alcoholysis method at room temperature and atmospheric pressure. X-ray diffraction (XRD) peaks exhibited a slight shift to lower diffraction angle with the increase of I content in BiOBr x I 1−x samples, which resulted in a gradual increase in their cell parameters. Field emission scanning electron microscopy (FESEM) and transmission electron microscope (TEM) images revealed that BiOBr x I 1−x samples exhibited 2D plate-like structure with the in-plane wrinkles. The regular changes in optical absorption threshold and E g value seen in UV-vis diffuse reflectance spectra (UV-vis DRS) indicated that the optical absorption property and band structure could be modulated by the formation of BiOBr x I 1−x solid solutions. The photocatalytic degradation of active dye Rhodamine B (RhB) over BiOBr x I 1−x solid solutions showed that BiOBr 0.75 I 0.25 had the best photocatalytic activity. The RhB photodegradation processes followed a pseudo-first-order kinetic model. The synergistic effect of structural factors (including amount of exposed {001} facets, interlayer spacing of (001) plane, and energy-level position of the valence band) determined the photocatalytic performance of BiOBr x I 1−x solid solutions.

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“…22 Therefore, it is possible to tune the band structure while strains are applied on BiOX. 23 In this paper, we researched the stability, electronic structures and bonding nature of BiOCl with different layers under both biaxial compressive and tensile strains using first-principle method. This work may help us take a deep look inside the material design for BiOX (X= Cl/Br/I).…”

Section: Introductionmentioning

confidence: 99%

Indirect-Direct Band Transformation of Few-Layer BiOCl under Biaxial Strain

Hao

Zhang

et al. 2016

J. Phys. Chem. C

Self Cite

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Being a new two-dimensional layered compounds, the tunable indirect-direct band transformation of BiOCl with different layers can be realized by introducing the biaxial tensile or compressive strains. The band structure and stability of BiOCl with different layers are first researched to clarify the influence of layer numbers. A phase transformation of bilayer BiOCl and metallic characteristic for all are observed under large tensile and compressive strains, respectively. In addition, bond length, interlayer spacing, and band decomposed charge density are calculated to analyze the mechanism behind these phenomena. The results indicate that the band structure transformation is primarily related to the competitions between two kinds of intralayer and interlayer Bi-O bonds and hybridizations between atoms under strains.

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Modulation of Photocatalytic Properties by Strain in 2D BiOBr Nanosheets

Cited by 138 publications

References 25 publications

Large‐Scale Ultrathin 2D Wide‐Bandgap BiOBr Nanoflakes for Gate‐Controlled Deep‐Ultraviolet Phototransistors

Large‐Scale Ultrathin 2D Wide‐Bandgap BiOBr Nanoflakes for Gate‐Controlled Deep‐Ultraviolet Phototransistors

Structure-Dependent Photocatalytic Performance of BiOBrxI1−x Nanoplate Solid Solutions

Indirect-Direct Band Transformation of Few-Layer BiOCl under Biaxial Strain

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