Synthesis and characterization of single- and few-layered MoS2 nanosheets
This protocol is extracted from research article:
Mass spectrometry imaging of the in situ drug release from nanocarriers
Sci Adv, Oct 31, 2018; DOI: 10.1126/sciadv.aat9039

Morrison method (27) was used in this paper to synthesize single- and few-layered MoS2 nanosheets. Briefly, 5 ml of 1.6 M n-butyllithium solution in hexane was added into 500 mg of MoS2 powder under a nitrogen atmosphere and then stirred for 48 hours at room temperature to complete lithium intercalation. After that, the mixture was filtered to remove unreacted lithium, and the semidry mixture on the filter was washed with 100 ml of hexane to remove other organic residues. Then, the mixture was quickly immersed into 150 ml of deionized water and ultrasonicated for 1 hour to effectively achieve exfoliation. The exfoliated MoS2 nanosheets were then centrifuged and washed with deionized water to remove LiOH precipitates and unexfoliated MoS2. Last, the obtained MoS2 nanosheet solution was dialyzed against deionized water using membranes [molecular weight cutoff (MWCO), 14 kDa] for 2 days and then stored at 4°C for future use. The synthesized single- and few-layered MoS2 nanosheets were characterized by TEM [HRTEM, JEM-2011, JEOL (Japan)], UV-vis spectroscopy [TU1900, Purkinje General Instrument Co. Ltd. (Beijing, China)], and Fourier transform infrared spectroscopy [TENSOR-27, Bruker Optics (Germany)].

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