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Title: High yield exfoliation of two-dimensional chalcogenides using sodium naphthalenide
Authors: Zheng, J.
Zhang, H.
Dong, S.
Liu, Y.
Tai Nai, C.
Suk Shin, H.
Young Jeong, H.
Liu, B.
Ping Loh, K. 
Issue Date: 2-Jan-2014
Citation: Zheng, J., Zhang, H., Dong, S., Liu, Y., Tai Nai, C., Suk Shin, H., Young Jeong, H., Liu, B., Ping Loh, K. (2014-01-02). High yield exfoliation of two-dimensional chalcogenides using sodium naphthalenide. Nature Communications 5 : -. ScholarBank@NUS Repository.
Abstract: 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 Li x MX n 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 μm 2. Single-layer dichalcogenide inks prepared by this method may be directly inkjet-printed on a wide range of substrates. © 2014 Macmillan Publishers Limited.
Source Title: Nature Communications
ISSN: 20411723
DOI: 10.1038/ncomms3995
Appears in Collections:Staff Publications

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