Identification of individual and few layers of WS2 using Raman ...
2013年4月30日 · Raman spectroscopy can not only be used to identify the number of layers 13,21,22,25,26, but also probe subtle details in the electronic band structure and phonon dispersion through resonant...
Raman spectra of WS2 (a) and WSe2 (c) ultrathin layers; (b) …
Figure 2a exhibits the Raman spectra of the WS 2 thin films deposited at various growth times. WS 2 generally has four Raman active vibrational modes, viz A 1g , E 1g , E 1 2g, and E 2 2g...
Raman scattering excitation spectroscopy of monolayer WS2
2017年7月11日 · Here we report on resonant Raman scattering study of monolayer WS 2. An extremely rich Raman scattering response is uncovered when using an unconventional spectroscopy scheme, referred to...
First-principles Raman spectra of MoS2, WS2 and their heterostructures
Raman spectra of MoS2, WS2, and their heterostructures are studied by density functional theory. We quantitatively reproduce existing experimental data and present evidence that the apparent discrepancy between intensity ratios observed experimentally can be explained by the high sensitivity of the Raman-act
Straightforward identification of monolayer WS2 structures by Raman …
2020年3月1日 · In this work, we report a straightforward Raman peak identification method to discriminate monolayer WS 2 crystals from few-layered and bulk samples. Here, this approach is applied to samples prepared by mechanical exfoliation and by CVD, but it is not restricted to samples prepared by other methods.
Deep-ultraviolet Raman scattering spectroscopy of monolayer WS2 ...
2018年7月30日 · In this paper, we report a resonant Raman scattering study of monolayer WS 2 with increasing laser excitation energies ranging from the near-infrared 785 nm (∼ 1.58 eV) to the deep-ultraviolet...
Excitation energy dependence of Raman spectra of few-layer WS2
2017年6月1日 · In this work, we measured the Raman spectra of mono- and few-layer WS 2 using up to seven excitation energies, some of which are in resonance with the A, B, or C exciton. Resonance effects are most pronounced in the low-frequency region in which the rigid shear and layer-breathing modes appear.
Raman tensor of layered WS2 | Science China Materials - Springer
2020年5月27日 · 为完善范德瓦尔斯层状材料有关于拉曼张量的基本信息, 本文采用角分辨偏振拉曼光谱对二硫化钨的拉曼张量进行研究. 根据拉曼选择定则, 我们分析了角分辨拉曼光谱与偏振的依赖关系, 并结合实验结果获得了面内和面外各振动模式的拉曼张量元和与张量元对应的微分极化率等信息. 实验结果表明, 截面测试得到的拉曼强度具有偏振依赖性, 其中沿c轴振动的A 1g 模式引起的微分极化率明显大于E 1g 和E 2g 模式, 并且A 1g 模式自身在沿c轴的极化率也较沿 a 轴或 b …
Straightforward identification of monolayer WS2 structures by Raman …
2020年3月1日 · Raman, photoluminescence, and fluorescence imaging revealed that the base WS 2 monolayer contains alternating triangular domains with different emission properties. It is observed that bilayer and trilayer grow selectively on less luminescent facet leading to fan-like morphology for second and third layers.
WS2 raman spectrum | Raman for life - RamanLife
Raman spectroscopy of WS 2. With the development of various ultrathin WS 2 ‐based devices, there has been a rapidly growing demand for the capabilities of the unique feature characterization and easy identification of atom-thick flakes.