Raman study of 2H-Mo1-xWxS2 layered mixed crystals

被引：93

作者：

Dumcenco, D. O. ^{[1
,3
]}

Chen, K. Y. ^{[1
]}

Wang, Y. P. ^{[1
]}

Huang, Y. S. ^{[1
]}

Tiong, K. K. ^{[2
]}

机构：

[1] Natl Taiwan Univ Sci & Technol, Dept Elect Engn, Taipei 106, Taiwan

[2] Natl Taiwan Ocean Univ, Dept Elect Engn, Chilung 202, Taiwan

[3] Moldavian Acad Sci, Inst Appl Phys, Kishinev, Moldova

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 506卷 / 02期

关键词：

Semiconductors; Layered crystals; Raman scattering; TRANSITION-METAL DICHALCOGENIDES; INELASTIC NEUTRON-SCATTERING; WAVELENGTH OPTICAL PHONONS; MOLYBDENUM-DISULFIDE; LATTICE-DYNAMICS; HEXAGONAL MOS2; HYDRODESULFURIZATION; CATALYSTS; 2H-WS2; PARAMETERS;

D O I：

10.1016/j.jallcom.2010.07.120

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A systematic study of a series of Mo1-xWxS2 layered mixed crystals, with 0 <= x <= 1, grown by the chemicalvapor transport method were carried out by using Raman scattering measurements. The peaks of the two dominant first-order Raman-active modes, A(1g) and E-2g(1), and several second-order bands have been observed in the range of 200-1000cm(-1). The peaks corresponding to A(1g) mode show one-mode type behavior while the peaks of E-2g(1) mode demonstrate two-mode type behavior for the entire series. The results can be explained on the basis of the atomic displacements for each mode. For A(1g) mode only sulfur atoms vibrate and this give rise to a one-mode type behavior for the mixed crystals. For E-2g(1) mode metal atoms also vibrate as well as sulfur atoms, the mass difference of the vibrating Mo and W cations causes the two-mode type behavior of E-2g(1) mode. In addition, the observation of largest asymmetry and broadening of A(1g) mode for Mo0.5W0.5S2 has been attributed to random alloy scattering. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：940 / 943

页数：4

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