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A real-time Raman spectroscopy study of the dynamics of laser-thinning of MoS2 flakes to monolayers.
- Source :
-
AIP Advances . 2017, Vol. 7 Issue 12, p125329-1-125329-9. 9p. 1 Color Photograph, 8 Graphs. - Publication Year :
- 2017
-
Abstract
- Transition metal dichalcogenides (TMDCs) in monolayer form have attracted a great deal of attention for electronic and optical applications. Compared to mechanical exfoliation and chemical synthesis, laser thinning is a novel and unique “on-demand” approach to fabricate monolayers or pattern desired shapes with high controllability and reproducibility. Its successful demonstration motivates a further exploration of the dynamic behaviour of this local thinning process. Here, we present an in-situ study of void formation by laser irradiation with the assistance of temporal Raman evolution. In the analysis of time-dependent Raman intensity, an empirical formula relating void size to laser power and exposure time is established. Void in thinner MoS2 flakes grows faster than in thicker ones as a result of reduced sublimation temperature in the two-dimensional (2D) materials. Our study provides useful insights into the laser-thinning dynamics of 2D TMDCs and guidelines for an effective control over the void formation. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 21583226
- Volume :
- 7
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- AIP Advances
- Publication Type :
- Academic Journal
- Accession number :
- 127115627
- Full Text :
- https://doi.org/10.1063/1.5008441