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Related Experiment Video

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Exfoliation and Analysis of Large-area, Air-Sensitive Two-Dimensional Materials
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Molecular Simulation of MoS2 Exfoliation.

Guoqing Zhou1, Pankaj Rajak2, Sandhya Susarla3

  • 1Collaboratory of Advanced Computing and Simulation, Department of Physics and Astronomy, University of Southern California, Los Angeles, USA.

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|November 15, 2018
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Summary

This study reveals how cavitation bubble collapse in water-isopropanol mixtures creates nanojets and shock waves that exfoliate molybdenum disulfide (MoS2) into nanosheets. These findings advance two-dimensional material synthesis through controlled cavitation.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Physical Chemistry

Background:

  • Liquid-phase exfoliation is a key method for synthesizing two-dimensional (2D) layered materials.
  • Molybdenum disulfide (MoS2) is a prominent 2D material with diverse applications.
  • Controlling exfoliation efficiency in solvents like water and isopropanol (IPA) mixtures is crucial.

Purpose of the Study:

  • To investigate the mechanism of MoS2 nanosheet exfoliation induced by cavitation bubble collapse.
  • To elucidate the role of nanojets and shock waves generated during bubble collapse.
  • To correlate simulation findings with experimental observations for optimized synthesis.

Main Methods:

  • Multimillion-atom molecular dynamics simulations using optimized force fields.
  • Experimental investigation of shock-induced cavitation bubble collapse.
  • Analysis of interfacial energies between MoS2 and the water-IPA solvent mixture.

Main Results:

  • Cavitation bubble collapse generates high-speed nanojets and shock waves.
  • Nanojet impact on MoS2 surfaces induces exfoliation via large shear stresses.
  • Reflected shock waves from MoS2 surfaces further enhance the exfoliation process.
  • Shock waves induce an ice VII-like motif in the water solvation shell.

Conclusions:

  • The study provides a detailed understanding of shock-induced exfoliation of MoS2.
  • This mechanism offers a pathway for efficient synthesis of 2D MoS2 nanosheets.
  • The findings have implications for advanced materials processing and nanotechnology.