Structural phase transition from 1H to 1T′ at low pressure in supported monolayer WS2: Raman study
We present pressure-dependent Raman studies on monolayer 1H tungsten disulfide (WS2) supported on a polymer substrate up to 20 GPa. The structural deformation starts at ~2.9 GPa by observing a split in A′1 mode. At ~8 GPa, first order Raman modes exhibit a change in pressure coefficients of phonon f...
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Published in | Solid state communications Vol. 336; p. 114412 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
01.10.2021
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Subjects | |
Online Access | Get full text |
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Summary: | We present pressure-dependent Raman studies on monolayer 1H tungsten disulfide (WS2) supported on a polymer substrate up to 20 GPa. The structural deformation starts at ~2.9 GPa by observing a split in A′1 mode. At ~8 GPa, first order Raman modes exhibit a change in pressure coefficients of phonon frequencies, and four new modes at 187, 248, 282, and 317 cm−1 appear, which become increasingly dominant with pressure. As the new modes are identified with the 1T′ phase, our Raman results show a mixed phase of 1T′ and 1H above 8 GPa. Our results suggest that biaxial (planar isotropic) compressive strain plays in inducing the phase transition at a relatively lower pressure in polymer-supported monolayer as compared to bulk WS2. |
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ISSN: | 0038-1098 1879-2766 |
DOI: | 10.1016/j.ssc.2021.114412 |