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Nano Lett. 2013 Aug 14;13(8):3447-54. doi: 10.1021/nl3026357. Epub 2012 Dec 14.

Extraordinary room-temperature photoluminescence in triangular WS2 monolayers.

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Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.


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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