Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 515, Issue -, Pages 27-31Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.01.023
Keywords
MoS2 nanosheet; Salt-assisted exfoliation; Liquid-phase exfoliation; Potassium ferrocyanide
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Funding
- opening fund of Hubei Key Laboratory of Bioinorganic Chemistry Materia Medica [BCMM201701]
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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Here, we report a facile salt-assisted direct liquid-phase exfoliation method for mass production of MoS2 nanosheets. We choose organic solvent isopropanol (IPA) as exfoliation media and potassium ferrocyanide, potassium sodium tartrate, or sodium tartrate as salt, the assistant. The selected salts show universal and efficient assistant effect for the exfoliation of MoS2 in IPA. Especially, potassium ferrocyanide (K4Fe(CN)(6)) can enhance the exfoliation efficiency up to 73 times and a dispersion of MoS2 nanosheets with concentration as high as 0.240 mg mL(-1) can be easily obtained in IPA-K4Fe(CN)(6) system. Transmission electron microscopy, atomic force microscopy (AFM), and Raman spectroscopy show that bulk MoS2 has been successfully exfoliated into mono- to few-layer MoS2 nanosheets. AFM analysis indicates that nearly 60% flakes are monolayer in MoS2 dispersion. (C) 2018 Elsevier Inc. All rights reserved.
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