In Situ Optical Tracking of Electroablation in Two-Dimensional Transition-Metal Dichalcogenides

Kumar, Anjli and Sebastian, Amritanand and Das, Saptarshi and Ringe, Emilie (2018) In Situ Optical Tracking of Electroablation in Two-Dimensional Transition-Metal Dichalcogenides. ACS Applied Materials & Interfaces, 10 (47). pp. 40773-40780. ISSN 1944-8244 DOI https://doi.org/10.1021/acsami.8b14585

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Abstract

Two-dimensional (2D) transition-metal dichalcogenides (TMDs) are a unique class of 2D materials possessing unique optoelectronic properties when exfoliated into mono- and few-layer sheets. Recently, electroablation (EA) has become of interest as a promising synthesis method for single-layer sheets of TMDs. Here, we introduce spectroelectrochemical micro-extinction spectroscopy (SE-MExS) as a high-throughput technique to study electrochemical thinning of TMDs as it occurs. This approach enables the parallel use of spectroscopy and imaging to nondestructively characterize 2D materials in situ. We unravel optoelectronics of the TMDs by observing changes in optical properties during EA. We find that the EA process for MoS2, WS2, MoSe2, and WSe2 occurs edge first, generating high density of edge sites. Our results show that stable monolayers of MoS2, WS2, and MoSe2 can be synthesized from bulk precursors by the EA process, while conversely, no WSe2 remains postablation.

Item Type:	Article
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences 08 - Green Open Access
Journal or Publication Title:	ACS Applied Materials & Interfaces
Volume:	10
Page Range:	pp. 40773-40780
Identification Number:	https://doi.org/10.1021/acsami.8b14585
Depositing User:	Sarah Humbert
Date Deposited:	11 Feb 2019 11:57
Last Modified:	15 Nov 2019 01:00
URI:	http://eprints.esc.cam.ac.uk/id/eprint/4407

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