High yield exfoliation of two-dimensional chalcogenides using sodium naphthalenide
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- High yield exfoliation of two-dimensional chalcogenides using sodium naphthalenide
- Zheng, Jian; Zhang, Han; Dong, Shaohua; Liu, Yanpeng; Nai, Chang Tai; Shin, Hyeon Suk; Jeong, Hu Young; Liu, Bo; Loh, Kian Ping
- SINGLE-LAYER MOS2; MOLYBDENUM-DISULFIDE; MONOLAYER MOS2; VALLEY POLARIZATION; ATOMIC LAYERS; GRAPHENE; INTERCALATION; TRANSISTORS; NANOSHEETS; PHOTOLUMINESCENCE
- Issue Date
- NATURE PUBLISHING GROUP
- NATURE COMMUNICATIONS, v.5, no., pp.2995 -
- 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 μm2. Single-layer dichalcogenide inks prepared by this method may be directly inkjet-printed on a wide range of substrates.
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