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

• DOI: 10.1021/acsami.8b14585
• Publication Date: 2018-11-02T09:25:52Z
• Authors: Anjli Kumar; Amritanand Sebastian; Saptarshi Das; Emilie Ringe
• Keywords: reflectance; TMDs; electroablation; spectroelectrochemistry; MExS; 02 engineering and technology; sub-03; 2D materials; 0210 nano-technology

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