Structural phase transition from 1H to 1T� at low pressure in supported monolayer WS2: Raman study

Thomas, A and Vikram, K and Muthu, DVS and Sood, AK (2021) Structural phase transition from 1H to 1T� at low pressure in supported monolayer WS2: Raman study. In: Solid State Communications, 336 .

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Abstract

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.� ���������������������������������������������� © 2021 Elsevier Ltd

Item Type:	Journal Article
Publication:	Solid State Communications
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd
Keywords:	Monolayers; Sulfur compounds, Compressive strain; Phonon frequencies; Pressure coefficients; Pressure dependent; Structural deformation; Structural phase transition; Supported monolayers; Tungsten disulfide, Tungsten compounds
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	01 Sep 2021 10:36
Last Modified:	01 Sep 2021 10:36
URI:	http://eprints.iisc.ac.in/id/eprint/69453

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