Journal
NATURE COMMUNICATIONS
Volume 5, Issue -, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/ncomms3995
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Funding
- MOE [R-143-000-556-112]
- NRF-CRP [R-144-000-295-281]
- Center for Advanced Soft Electronics through the National Research Foundation [2011-0031630]
- Ministry of Science, ICT and Future Planning, Korea
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Transition-metal dichalcogenides like molybdenum disulphide have attracted great interest as two-dimensional materials beyond graphene due to their unique electronic and optical properties. Solution-phase processes can be a viable method for producing printable single-layer chalcogenides. Molybdenum disulphide can be exfoliated into monolayer flakes using organolithium reduction chemistry; unfortunately, the method is hampered by low yield, submicron flake size and long lithiation time. Here we report a high-yield exfoliation process using lithium, potassium and sodium naphthalenide where an intermediate ternary LixMXn crystalline phase (X = selenium, sulphur, and so on) is produced. Using a two-step expansion and intercalation method, we produce high-quality single-layer molybdenum disulphide sheets with unprecedentedly large flake size, that is up to 400 mu m(2). Single-layer dichalcogenide inks prepared by this method may be directly inkjet-printed on a wide range of substrates.
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