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Updated: Jan 21, 2026
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Temperature-programmed Deoxygenation of Acetic Acid on Molybdenum Carbide Catalysts
Published on: February 7, 2017
11.8K
Sonochemical edge functionalisation of molybdenum disulfide
Aline Amorim Graf1, Matthew J Large1, Sean P Ogilvie1
1University of Sussex, Brighton, BN1 9QH, UK. a.amorim-graf@sussex.ac.uk a.b.dalton@sussex.ac.uk.
Nanoscale
|August 9, 2019
Summary
Molybdenum disulfide (MoS2) nanosheets exfoliated in acetone exhibit superior concentration and stability. This enhanced performance is due to oxygen edge functionalization, improving solubility and enabling potential pre-treatment applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Liquid-phase exfoliation (LPE) is a scalable method for producing high-quality 2D material dispersions.
- Traditional LPE methods often rely on surfactants or high-boiling point organic solvents, which present toxicity and residue issues.
- Achieving stable, high-concentration dispersions in low-boiling point solvents remains a challenge.
Purpose of the Study:
- To investigate the enhanced stability and concentration of molybdenum disulfide (MoS2) nanosheets exfoliated in acetone.
- To elucidate the underlying mechanisms responsible for the improved dispersion properties.
- To evaluate the catalytic performance of MoS2 nanosheets exfoliated in acetone for the hydrogen evolution reaction.
Main Methods:
- Liquid-phase exfoliation of MoS2 in acetone.
- Characterization using UV-visible spectroscopy, zeta potential, atomic force microscopy, Raman spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and scanning transmission electron microscopy with electron energy loss spectroscopy.
- Catalytic testing for the hydrogen evolution reaction.
Main Results:
- MoS2 dispersions in acetone showed significantly higher concentration and stability than predicted by Hansen parameter analysis.
- Characterization revealed oxygen edge functionalization (molybdenum oxides) on the MoS2 nanosheets exfoliated in acetone.
- The functionalization altered solvent interactions, explaining the enhanced dispersion quality and stability in a low-boiling point solvent.
Conclusions:
- Acetone-assisted exfoliation leads to oxygen-functionalized MoS2 nanosheets with improved solubility and stability.
- This functionalization mechanism offers a pathway to enhance the processability of MoS2.
- Acetone exfoliation can serve as a pretreatment for modifying MoS2 solubility for various applications.
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