Substrate-free layer-number identification of two-dimensional materials: A case of MoWS alloy
arXiv:1505.04236 · doi:10.1063/1.4921911
Abstract
Any of two or more two-dimensional (2D) materials with similar properties can be alloyed into a new layered material, namely, 2D alloy. Individual monolayer in 2D alloys are kept together by Van der Waals interactions. The property of multilayer alloys is a function of their layer number. Here, we studied the shear (C) and layer-breathing (LB) modes of MoWS alloy flakes and their link to the layer number of alloy flakes. The study reveals that the disorder effect is absent in the C and LB modes of 2D alloys, and the monatomic chain model can be used to estimate the frequencies of the C and LB modes. We demonstrated how to use the C and LB mode frequency to identify the layer number of alloy flakes deposited on different substrates. This technique is independent of the substrate, stoichiometry, monolayer thickness and complex refractive index of 2D materials, offering a robust and substrate-free approach for layer-number identification of 2D materials.
5 pages, 4 figures
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Cited by in corpus (8)
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- Physical origin of Davydov splitting and resonant Raman spectroscopy of Davydov components in multilayer MoTe2
- Zone-center phonons of bulk, few-layer, and monolayer 1T-TaS: Detection of the commensurate charge density wave phase through Raman scattering
- Electronic and Vibrational Properties of PbI 2 : From Bulk to Monolayer
- Stacking-Dependent Interlayer Phonons in 3R and 2H MoS
- Strain Mapping In Single-Layer 2D Crystals Via Raman Activity
- Determining layer number of two dimensional flakes of transition-metal dichalcogenides by the Raman intensity from substrate
- Infrared study of the pressure-induced isostructural metallic transition in MoWS