Raman tensor of layered WS2

Ding, Ying; Zheng, Wei; Lin, Zeguo; Zhu, Ruinan; Jin, Mingge; Zhu, Yanming; Huang, Feng

doi:10.1007/s40843-020-1321-4

Cited by 21 publications

(17 citation statements)

References 47 publications

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“…The measurement geometry is shown in Fig. 1a [24][25][26][27][28][29][30][31][32][33][34], where a polarizer with fixed polarization direction was placed in the collecting optical path to ensure that the polarization direction of scattering light was strictly consistent with that of pump light. In order to avoid the influences of pump light absorption and resonance Raman scattering on the intensity of scattering light, 488-nm Ar+ gas laser was used as pump light and focused on the AlN surface through a 50× quartz lens [35][36][37][38][39].…”

Section: Laser Tuning In Aln Single Crystalsmentioning

confidence: 99%

Laser tuning in AlN single crystals

et al. 2021

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Section: Laser Tuning In Aln Single Crystalsmentioning

confidence: 99%

Laser tuning in AlN single crystals

et al. 2021

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“…Considering the test conditions, in a parallel backscatter configuration ( e i ∥ e s ), the polarization e i of incident light can be defined as (cosθ, sinθ, 0), and polarization e s of the scattered light is

(\begin{matrix} \cos normal θ \\ \sin normal θ \\ 0 \end{matrix})

, where θ is the angle between the polarization direction of incident light and a ‐axis of β‐HgI 2 crystal (see Figure S4 in the Supporting Information for more details). Therefore, the Raman scattering intensity of A 1 mode can be derived as [ 21 ]

\begin{matrix} I (normalA 1, ∥) \sim {|a|}^{2} \cos^{4} θ + {|b|}^{2} \sin^{4} θ + 1 / 2 (||, a) (||, b) \sin^{2} (2 θ) \cos (φ_{a} - φ_{b}) \end{matrix}

…”

Section: Figurementioning

confidence: 99%

2D van der Waals Molecular Crystal β‐HgI₂: Economical, Rapid, and Substrate‐Free Liquid‐Phase Synthesis and Strong In‐Plane Optical Anisotropy

Lin

Ding

Zheng

et al. 2020

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Abstract2D materials have a great potential for wide‐range applications due to their adjustable bandgap characteristics and special crystal structures. β‐HgI2 is a new 2D van der Waals inorganic molecular crystal material with a wide bandgap of 4.03 eV, on whose preparation and properties there are few relevant reports due to the feature of instability of molecular crystals. Here, an economical method to control the synthesis of large‐size 2D β‐HgI2 single crystal by using a mineralizer‐assisted solution is reported. According to angle‐resolved polarization Raman spectroscopy and first‐principles optical absorption calculation, 2D β‐HgI2 flake has a strong in‐plane anisotropic light scattering characteristic and high optical absorption dichroism (az/ay = 3.4), which is due to a low in‐plane symmetry of the orthorhombic structure of β‐HgI2. More importantly, due to the molecular crystal structure of β‐HgI2, its sensitivity to temperature is less than that of 2D materials such as MoS2, which has been confirmed by temperature‐dependent Raman spectroscopy. In the work, more 2D inorganic molecular crystals are studied in the aspect of growth, which provides a theoretical basis for 2D molecular crystal optoelectronic devices’ potential applications.

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“…However, WO 3 shows weak catalytic activity in neutral condition, while, the preparation process of W 2 N 3 -based NRR catalyst suffers from the complex preparation process. Single-layer WS 2 nanosheets are composed of S-W-S sandwich arrays, which show a graphene-like structure with high electron mobility, moderate band gap, and abundant active sites [23,24], and have been applied in many fields, such as photocatalysis [25], and lithium/sodium storage [26]. In addition, defect engineering is an effective strategy to tune the electronic structure and increase the number of reactive sites, leading to a reduction in the reaction energy barrier [27].…”

Section: Introductionmentioning

confidence: 99%

Sulfur defect-rich WS2−x nanosheet electrocatalysts for N2 reduction

Kong

Liu

et al. 2021

Sci. China Mater.

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Seeking catalysts with high electrocatalytic activity for ambient-condition N 2 reduction reaction (NRR) remains an ongoing challenge due to the chemical inertness of N 2. Herein, defect-rich WS 2 nanosheets (WS 2−x) were designed as an efficient electrocatalyst for NRR, which were prepared via vulcanizing the oxygen-vacancy-rich tungsten oxide in a vacuum tube. The sulfur defects were conducive to the adsorption and activation of N 2. In neutral electrolyte of 0.1 mol L −1 Na 2 SO 4 at −0.60 V vs. reversible hydrogen electrode, such WS 2−x offered a high Faradaic efficiency of 12.1% with a NH 3 generation rate of 16.38 µg h −1 mg cat. −1 .

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Raman tensor of layered WS2

Cited by 21 publications

References 47 publications

Laser tuning in AlN single crystals

Laser tuning in AlN single crystals

2D van der Waals Molecular Crystal β‐HgI₂: Economical, Rapid, and Substrate‐Free Liquid‐Phase Synthesis and Strong In‐Plane Optical Anisotropy

Sulfur defect-rich WS2−x nanosheet electrocatalysts for N2 reduction

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Raman tensor of layered WS2

Cited by 21 publications

References 47 publications

Laser tuning in AlN single crystals

Laser tuning in AlN single crystals

2D van der Waals Molecular Crystal β‐HgI2: Economical, Rapid, and Substrate‐Free Liquid‐Phase Synthesis and Strong In‐Plane Optical Anisotropy

Sulfur defect-rich WS2−x nanosheet electrocatalysts for N2 reduction

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2D van der Waals Molecular Crystal β‐HgI₂: Economical, Rapid, and Substrate‐Free Liquid‐Phase Synthesis and Strong In‐Plane Optical Anisotropy