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Molybdenum disulfide(MoS2),a new two-dimensional(2D)layered transitional metal with strong bonding within the layers and weak interlayer interactions exhibits excellent properties in catalysis and lubrication,which has received considerable attention recently.Compared to the zero gap electronic structure of graphene,MoS2 shows potential application in the field of optoelectronic devices,due to its inherent band gap.