Controlled Exfoliation of MoS2 Crystals into Trilayer Nanosheets.

@article{Fan2016ControlledEO,
  title={Controlled Exfoliation of MoS2 Crystals into Trilayer Nanosheets.},
  author={Xiaobing Fan and Pengtao Xu and Yuguang C. Li and Dekai Zhou and Yifan Sun and Minh An T. Nguyen and Mauricio Terrones and Thomas E. Mallouk},
  journal={Journal of the American Chemical Society},
  year={2016},
  volume={138 15},
  pages={
          5143-9
        }
}
The controlled exfoliation of transition metal dichalcogenides (TMDs) into pristine single- or few-layer nanosheets remains a significant barrier to fundamental studies and device applications of TMDs. Here we report a novel strategy for exfoliating crystalline MoS2 into suspensions of nanosheets with retention of the semiconducting 2H phase. The controlled reaction of MoS2 with substoichiometric amounts n-butyllithium results in intercalation of the edges of the crystals, which are then… 
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The preparation of 1-2 layer semiconducting WS2 nanosheets in a yield of 18-22 wt % by a modified LPE method that involves preintercalation with substoichometric quantities of n-butyllithium is reported.
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A facile cryo-mediated liquid phase exfoliation method is reported to synthesize water-soluble defect-rich MoS2 ultrathin nanosheets (d-MoS2 NSs) with the assistance of NaBH4 in the solvent to show enhanced electrocatalytic hydrogen evolution reaction (HER) performance.
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In-plane X-ray diffraction of the nanosheets indicates that the 1T structure was preserved after reoxidation upon aging the dispersions in air, suggesting the formation of metastable neutral MoS2.
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