High Stability of 1T-Phase MoS2 xSe2(1- x)Monolayers under Ambient Conditions

Jenjeti, RN and Kumar, R and Sellam, A and Sampath, S (2021) High Stability of 1T-Phase MoS2 xSe2(1- x)Monolayers under Ambient Conditions. In: Journal of Physical Chemistry C, 125 (15). pp. 8407-8417.

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Abstract

The phase stability in transition metal dichalcogenides (TMDs) is very significant for their utility in various applications. In particular, the 1T phase of group VI TMDs is of high technological importance owing to its electrically conducting properties and phase stability via strain engineering and chemical functionalization has been reported in the literature. In this regard, alloying with atoms of different sizes is an effective approach to introduce inherent strain in the lattice by modifying bond parameters. In the present study, it has been shown that the 1T polymorph of layered chalcogenides gets stabilized in strained, mixed chalcogen alloys, MoS2xSe2(1-x). The 2H phases of MoS2xSe2(1-x) are amenable for efficient chemical exfoliation to monolayers and successful conversion to metallic 1T phase. The metallic 1T phase of MoS2xSe2(1-x) with inherent strain is found to be very stable for a long duration under ambient conditions. Owing to different Mo-S and Mo-Mo bond lengths in mixed chalcogenides, effective tuning of stability is achieved by changing the S/Se ratio in the compound. The differential scanning calorimetry data reveals a shift in the thermal phase transition with a peak maximum at ∼160 °C in the case of 1T MoSSe which is different from its pristine counterparts. Ex situ XRD and Raman spectroscopic studies suggest the role of inherent strain in retaining the octahedral structure at high temperatures. The alloying approach may be extended to other transition metal chalcogenides to fully explore the potential of metastable polytypes. © 2021 American Chemical Society.

Item Type:	Journal Article
Publication:	Journal of Physical Chemistry C
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society
Keywords:	Alloying; Binary alloys; Chalcogenides; Differential scanning calorimetry; Layered semiconductors; Molybdenum compounds; Monolayers; Phase stability; Spectroscopic analysis; Transition metals, Chemical exfoliations; Chemical functionalization; Conducting properties; Layered chalcogenides; Raman spectroscopic study; Thermal phase transition; Transition metal chalcogenides; Transition metal dichalcogenides, Chemical stability
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	22 Jul 2021 08:54
Last Modified:	13 Apr 2023 09:29
URI:	https://eprints.iisc.ac.in/id/eprint/68886

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