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Exfoliation and Analysis of Large-area, Air-Sensitive Two-Dimensional Materials
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Imidazolium Ionic Liquid Mediates Black Phosphorus Exfoliation while Preventing Phosphorene Decomposition.
Vitaly V Chaban1, Eudes Eterno Fileti1, Oleg V Prezhdo2
1Instituto de Ciência e Tecnologia, Universidade Federal de São Paulo , São José dos Campos, São Paulo 12247-014, Brazil.
ACS Nano
|May 31, 2017
Summary
Ionic liquid [EMIM][BF4] effectively exfoliates phosphorene, a promising material for electronics. This method facilitates industrial-scale production by protecting phosphorene from moisture and oxygen.
Area of Science:
- Materials Science
- Nanotechnology
- Computational Chemistry
Background:
- Phosphorene is a promising 2D material for electronics and optoelectronics.
- Solvent-assisted exfoliation is key for industrial-scale phosphorene production.
Purpose of the Study:
- To investigate the efficacy of 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF4]) as a solvent for phosphorene exfoliation.
- To elucidate the molecular mechanisms underlying phosphorene solvation and exfoliation in [EMIM][BF4].
Main Methods:
- Molecular dynamics simulations including equilibrium, steered, and umbrella sampling.
- Analysis of solvent-exfoliant interactions and thermodynamic favorability.
Main Results:
- [EMIM][BF4] is an effective solvent for phosphorene exfoliation, facilitating sheet separation and protection.
- Solvation occurs via hydrophobic side chains of [EMIM][BF4], with polar imidazole rings providing electrostatic stabilization.
- Exfoliation thermodynamics are moderately unfavorable, suggesting the need for external stimuli.
Conclusions:
- [EMIM][BF4] shows significant potential for industrial phosphorene production.
- Solvent engineering strategies should focus on weak coordination, enhanced dispersion interactions, and nonpolar chain elongation for improved exfoliation.
