High-concentration aqueous dispersions of MoS2

Yagang Yao, Lorenzo Tolentino, Zhongzheng Yang, Xiaojuan Song, Wen Zhang, Yongsheng Chen, Ching Ping Wong

Research output: Contribution to journalArticlepeer-review

233 Scopus citations

Abstract

Molybdenum disulfide (MoS2) nanosheets have been attracting increasing research interests due to their unique material properties. However, the lack of a reliable large-scale production method impedes their practical applications. Here a facile, efficient, and scalable method for the fabrication of high-concentration aqueous dispersion of MoS2 nanosheets using combined grinding and sonication is reported. The 26.7 ± 0.7 mg/mL concentration achieved is the highest concentration in an aqueous solution reported up to now. Grinding generates pure shear forces to detach the MoS 2 layers from the bulk materials. Subsequent sonication further breaks larger crystallites into smaller crystallites, which promotes the dispersion of MoS2 nanosheets in ethanol/water solutions. The exfoliation process establishes a new paradigm in the top-down fabrication of 2D nanosheets in aqueous solution. In the meantime, MoS2-based sensing film produced using this approach has successfully demonstrated the feasibility of a low-cost and efficient NH3 gas sensor using inkjet printing as a viable method.

Original languageEnglish (US)
Pages (from-to)3577-3583
Number of pages7
JournalAdvanced Functional Materials
Volume23
Issue number28
DOIs
StatePublished - Jul 26 2013

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • NH gas sensors
  • combined grinding and sonication
  • exfoliation
  • molybdenum disulfide nanosheets

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