# Exfoliation of Graphene and Fluorographene in Molecular and Ionic Liquids

## TL;DR

This study uses molecular dynamics simulations to evaluate how different liquids facilitate the exfoliation of graphene and fluorographene, identifying optimal solvents and elucidating interfacial ion arrangements.

## Contribution

It provides new insights into solvent effects on nanomaterial exfoliation, especially the role of ionic liquid structure and interfacial ion organization.

## Key findings

- Small amides are effective solvents for exfoliation.
- Long alkyl chains on ionic cations improve exfoliation.
- Fluorographene is more hydrophobic with distinct interfacial ion layering.

## Abstract

We use molecular dynamics simulation to study the exfoliation of graphene and fluorographene in molecular and ionic liquids, by performing computer experiments in which one layer of the 2D nanomaterial is peeled from a stack, in vacuum and in the presence of solvent. The liquid media and the nanomaterials are represented by fully flexible, atomistic force fields. From these simulations we calculate the potential of mean force, or reversible work, required to exfoliate the materials. Calculations in water and organic liquids showed that small amides (NMP, DMF) are among the best solvents for exfoliation, in agreement with experiment. We tested ionic liquids with different cation and anion structures, allowing us to learn about their solvent quality for exfoliation of the nanomaterials. First, a long alkyl side chain on the cation is favourable for exfoliation of both graphene and fluorographene. The presence of aromatic groups on the cation is also favourable for graphene. No beneficial effect was found between fluorine-containing anions and fluorographene. We also analysed the ordering of ions in the interfacial layers with the materials. Near graphene, nonpolar groups are found but also charged groups, whereas near fluorographene almost exclusively non-charged groups are found, with ionic moieties segregated to second layer. Therefore, fluorographene appears as a more hydrophobic surface, as expected.