Determining alloy composition in MoxW(1 − x)S2 from low wavenumber Raman spectroscopy. (16th February 2017)

• Record Type: Journal Article
• Authors: Livneh, Tsachi; Dumcenco, Dumitru O.; Pinkas, Iddo
• Is Part Of: Journal of Raman spectroscopy. Volume 48:Number 5(2017)
• Page Start: 773
• Page End: 776
• Publication Date: 2017-02-16
• Subjects: mixed alloy 2D dichalcogenides -- low wavenumber Raman scattering -- shear modes; Raman spectroscopy -- Periodicals; 535.846
• DOI: 10.1002/jrs.5114
• Languages: English
• ISSNs: 0377-0486

Abstract

Abstract : Mixed alloy Mo x W(1 − x ) S2 (0 ≤ x ≤ 1) bulk samples are characterized by low wavenumber Raman spectroscopy. The results provide a convenient and reliable means for systematically determining the sample Mo/W composition. The absence of disorder effects in its interlayer motion (unlike for the intralayer motion) and the lack of Mo/W composition dependence of the shear mode force constants enable the facile employment of a reduced monoatomic linear chain model by treating the bulk alloy as a series of 'single balls' of mass ( xm Mo + (1 − x ) m W + 2 m S ) attached by interlayer springs with a composition‐independent interlayer force constant of 2.52 N m . Shear mode Raman scattering analysis may consequently be complementary to the electronic spectroscopy tools (X‐ray photoelectron spectroscopy (XPS) and energy‐dispersive X‐ray spectroscopy (EDS)), commonly used for mixed alloy bulk composition characterization. Copyright © 2017 John Wiley & Sons, Ltd. Abstract : Mixed alloy MoxW(1‐x) S2 (0 ≤ x ≤ 1) bulk samples are characterized by low wavenumber Raman spectroscopy. The absence of disorder effects in its interlayer motion (unlike for the intralayer motion) and the lack of Mo/W composition dependence of the shear mode force constants enables the facile employment of a reduced monoatomic linear chain model. The results provide a convenient and reliable means for systematically determining the sample Mo/W composition.