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Molybdenum disulfide (MoS 2 ) was recently found to exhibit an indirect-to-direct gap transition when its thickness is reduced to a single S-Mo-S trilayer sheet, which opens up opportunities for a range of novel optoelectronic applications. Here we first report the possibility of dispersant-free efficient liquid exfoliation down to the graphene-like state of solvent-free mechanochemically delaminated bulk MoS 2 .The graphene-like, single-sheet structure of MoS 2 nanoparticles in the dispersions is confirmed by mutually complementary experimental methods. The proposed approach essentially improves the known liquid exfoliation method based on the ultrasound disintegration of bulk MoS 2 , because the proposed mechanochemical treatment of the initial bulk MoS 2 could provide 100% yield of the singlesheet nanoparticles without the use of dispersants.

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