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Extraordinary Room-Temperature Photoluminescence in Triangular WS2 Monolayers

Gutiérrez, Humberto R ; Perea-López, Nestor ; Elías, Ana Laura ; Berkdemir, Ayse ; Wang, Bei ; Lv, Ruitao ; López-Urías, Florentino ; Crespi, Vincent H ; Terrones, Humberto ; Terrones, Mauricio

Nano letters, 2013-08, Vol.13 (8), p.3447-3454 [Periódico revisado por pares]

Washington, DC: American Chemical Society

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Título:
Extraordinary Room-Temperature Photoluminescence in Triangular WS2 Monolayers
Autor: Gutiérrez, Humberto R ; Perea-López, Nestor ; Elías, Ana Laura ; Berkdemir, Ayse ; Wang, Bei ; Lv, Ruitao ; López-Urías, Florentino ; Crespi, Vincent H ; Terrones, Humberto ; Terrones, Mauricio
Assuntos: Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Condensed matter: structure, mechanical and thermal properties ; Electron states and collective excitations in thin films, multilayers, quantum wells, mesoscopic and nanoscale systems ; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures ; Exact sciences and technology ; Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties ; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation ; Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures ; Physics ; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties)
É parte de: Nano letters, 2013-08, Vol.13 (8), p.3447-3454
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Descrição: 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.
Editor: Washington, DC: American Chemical Society
Idioma: Inglês

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Extraordinary Room-Temperature Photoluminescence in Triangular WS2 Monolayers

Gutiérrez, Humberto R ; Perea-López, Nestor ; Elías, Ana Laura ; Berkdemir, Ayse ; Wang, Bei ; Lv, Ruitao ; López-Urías, Florentino ; Crespi, Vincent H ; Terrones, Humberto ; Terrones, Mauricio

Washington, DC: American Chemical Society

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