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In this work,molybdenum disulfide(MoS2)nanosheets were facilely prepared by direct exfoliation of MoS2 in aqueous media with the assistance of sodium alginate(SA).Transmission electron microscopy(TEM),X-ray diffraction(XRD)and Raman spectra results showed that the raw MoS2 was successfully exfoliated into few-layer MoS2 nanosheets(SA-MoS2).