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

Anjli Kumar, Amritanand Sebastian, Saptarshi Das, Emilie Ringe

Research output: Contribution to journalArticle

1 Citation (Scopus)

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 MoS 2 , WS 2 , MoSe 2 , and WSe 2 occurs edge first, generating high density of edge sites. Our results show that stable monolayers of MoS 2 , WS 2 , and MoSe 2 can be synthesized from bulk precursors by the EA process, while conversely, no WSe 2 remains postablation.

Original languageEnglish (US)
Pages (from-to)40773-40780
Number of pages8
JournalACS Applied Materials and Interfaces
Volume10
Issue number47
DOIs
StatePublished - Nov 28 2018

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Transition metals
Optoelectronic devices
Spectroscopy
Monolayers
Optical properties
Throughput
Imaging techniques

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Kumar, Anjli ; Sebastian, Amritanand ; Das, Saptarshi ; Ringe, Emilie. / In Situ Optical Tracking of Electroablation in Two-Dimensional Transition-Metal Dichalcogenides. In: ACS Applied Materials and Interfaces. 2018 ; Vol. 10, No. 47. pp. 40773-40780.
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In Situ Optical Tracking of Electroablation in Two-Dimensional Transition-Metal Dichalcogenides. / Kumar, Anjli; Sebastian, Amritanand; Das, Saptarshi; Ringe, Emilie.

In: ACS Applied Materials and Interfaces, Vol. 10, No. 47, 28.11.2018, p. 40773-40780.

Research output: Contribution to journalArticle

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