Journal
NANO LETTERS
Volume 13, Issue 8, Pages 3447-3454Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl3026357
Keywords
Metal dichalcogenides; tungsten disulfide; 2D materials; photoluminescence; Raman
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Funding
- U.S. Army Research Office MURI [W911NF-11-1-0362]
- Materials Simulation Center of the Materials Research Institute
- Research Computing and Cyberinfrastructure unit of Information Technology Services
- Penn-State Center for Nanoscale Science
- Penn State Center for Nanoscale Science [DMR-0820404]
- Pennsylvania State University Materials Research Institute Nanofabrication Lab
- National Science Foundation [ECS-0335765]
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Individual monolayers of metal dichalcogenides are atomically thin two-dimensional crystals with attractive physical properties different from those of their bulk counterparts. Here we describe the direct synthesis of WS2 monolayers with triangular morphologies and strong room-temperature photoluminescence (PL). The Raman response as well as the luminescence as a function of the number of S-W-S layers is also reported. The PL weakens with increasing number of layers due to a transition from direct band gap in a monolayer to indirect gap in multilayers. The edges of WS2 monolayers exhibit PL signals with extraordinary intensity, around 25 times stronger than that at the platelet's center. The structure and chemical composition of the platelet edges appear to be critical for PL enhancement.
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