Photoluminescence from Chemically Exfoliated MoS 2
Abstract
A two-dimensional crystal of molybdenum disulfide (MoS2) monolayer is a photoluminescent direct gap semiconductor in striking contrast to its bulk counterpart. Exfoliation of bulk MoS2 via Li intercalation is an attractive route to large-scale synthesis of monolayer crystals. However, this method results in loss of pristine semiconducting properties of MoS2 due to structural changes that occur during Li intercalation. Here, we report structural and electronic properties of chemically exfoliated MoS2. The metastable metallic phase that emerges from Li intercalation was found to dominate the properties of as-exfoliated material, but mild annealing leads to gradual restoration of the semiconducting phase. Above an annealing temperature of 300 °C, chemically exfoliated MoS2 exhibit prominent band gap photoluminescence, similar to mechanically exfoliated monolayers, indicating that their semiconducting properties are largely restored.
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The exfoliated MoS2 thin sheets have a lateral size at the micrometer scale, about 2 orders of magnitude higher than lithium intercalated methods.
“Figure 1d,e shows that the exfoliated MoS2 thin sheets can be achieved at the micrometer scale in lateral size, which is about 2 orders of magnitude higher than lithium intercalated methods.37,38”
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- Authors
- Eda, G., Yamaguchi, H., Voiry, D., Fujita, T., Chen, M., & Chhowalla, M.
- Affiliations
- National University of Singapore (SG)
- Rutgers, The State University of New Jersey (US)
- Tohoku University (JP)
- Corresponding author
- Eda, Goki
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-11-07
- Volume
- 11
- Issue
- 12
- Pages
- 5111-5116
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2007195468
- Cited by
- 3,896
- References
- 0
- Citations by year
- 2026: 102 · 2025: 174 · 2024: 199 · 2023: 238 · 2022: 303 · 2021: 343 · 2020: 338 · 2019: 387 · 2018: 356 · 2017: 372 · 2016: 359 · 2015: 308 · 2014: 229 · 2013: 136 · 2012: 51
- FWCI
- 65.22
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Nano Letters (publishedVersion)
- PubMed (publishedVersion)
- National University of Singapore (submittedVersion)
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › 2D Materials and Applications
- Physical Sciences › Materials Science › Materials Chemistry › Graphene research and applications
- Physical Sciences › Materials Science › Polymers and Plastics › Transition Metal Oxide Nanomaterials
- Keywords
- MoS2, monolayer MoS2, two-dimensional crystals, chemical exfoliation, lithium intercalation, photoluminescence, band gap, semiconducting behavior, metallic phase, annealing, structural phase transition
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