Liquid-Phase Exfoliation of MoS2 Nanosheets: The Critical Role of Trace Water
| Autor: | Sukumaran Vasudevan, Amit Gupta, Vaishali Arunachalam |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Chemistry
Inorganic chemistry Relaxation (NMR) 02 engineering and technology Nuclear Overhauser effect 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Exfoliation joint 0104 chemical sciences Nanomaterials Solvent Molecular dynamics Chemical engineering Molecule General Materials Science Physical and Theoretical Chemistry 0210 nano-technology Dispersion (chemistry) |
| Zdroj: | The Journal of Physical Chemistry Letters. 7:4884-4890 |
| ISSN: | 1948-7185 |
| Popis: | Sonication-assisted liquid-phase exfoliation of layered materials in suitable organic solvents offers a simple scalable route for the production of 2D nanomaterials. N-methyl-2-pyrrolidone (NMP) is one of the most efficient solvents for liquid-phase exfoliation of a variety of layered solids, including MoS2. We show here that trace water present in NMP is crucial for the stability of MoS2 nanosheets in NMP dispersions. In the absence of water, the sheets are fragmented and chemically unstable. Using solution NMR techniques, 2D nuclear Overhauser effect and spin–lattice relaxation measurements, supported by classical molecular dynamics simulations, we are able to establish the role of water molecules in stabilizing the dispersion. We show that water molecules are localized at the Mo-terminated edges of the MoS2 sheets, thereby inhibiting chemical erosion of the sheets, and they also exhibit enhanced interactions with the solvent NMP molecules, leading to the stability of the dispersion. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|