Extraordinary room-temperature photoluminescence in triangular WS 2 monolayers

Humberto R. Gutiérrez, Nestor Perea Lopez, Ana Laura Elias Arriaga, Ayse Berkdemir, Bei Wang, Ruitao Lv, Florentino López-Urías, Vincent Henry Crespi, Humberto Terrones, Mauricio Terrones Maldonado

Research output: Contribution to journalArticle

788 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)3447-3454
Number of pages8
JournalNano letters
Volume13
Issue number8
DOIs
StatePublished - Aug 14 2013

Fingerprint

Monolayers
Photoluminescence
photoluminescence
room temperature
Platelets
platelets
Temperature
Electron transitions
Luminescence
Multilayers
chemical composition
Energy gap
Physical properties
physical properties
Metals
luminescence
Crystals
augmentation
synthesis
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Gutiérrez, Humberto R. ; Perea Lopez, Nestor ; Elias Arriaga, Ana Laura ; Berkdemir, Ayse ; Wang, Bei ; Lv, Ruitao ; López-Urías, Florentino ; Crespi, Vincent Henry ; Terrones, Humberto ; Terrones Maldonado, Mauricio. / Extraordinary room-temperature photoluminescence in triangular WS 2 monolayers. In: Nano letters. 2013 ; Vol. 13, No. 8. pp. 3447-3454.
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Extraordinary room-temperature photoluminescence in triangular WS 2 monolayers. / Gutiérrez, Humberto R.; Perea Lopez, Nestor; Elias Arriaga, Ana Laura; Berkdemir, Ayse; Wang, Bei; Lv, Ruitao; López-Urías, Florentino; Crespi, Vincent Henry; Terrones, Humberto; Terrones Maldonado, Mauricio.

In: Nano letters, Vol. 13, No. 8, 14.08.2013, p. 3447-3454.

Research output: Contribution to journalArticle

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AU - Gutiérrez, Humberto R.

AU - Perea Lopez, Nestor

AU - Elias Arriaga, Ana Laura

AU - Berkdemir, Ayse

AU - Wang, Bei

AU - Lv, Ruitao

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