Adsorption of common solvent molecules on graphene and MoS2 from first-principles
File Type:
PDFItem Type:
Journal ArticleDate:
2018Access:
openAccessCitation:
Patil, U. & Caffrey, N.M., Adsorption of common solvent molecules on graphene and MoS2 from first-principles, The Journal of Chemical Physics, 149, 2018, 094702Download Item:
Abstract:
Solvents are an essential element in the production and processing of two-dimensional (2D) materials. For example, the liquid-phase exfoliation of layered materials requires a solvent to prevent the resulting monolayers from re-aggregating, while solutions of functional atoms and molecules are routinely used to modify the properties of the layers. It is generally assumed that these solvents do not interact strongly with the layer and so their effects can be neglected. Yet experimental evidence has suggested that explicit atomic-scale interactions between the solvent and layered material may play a crucial role in exfoliation and cause unintended electronic changes in the layer. Little is known about the precise nature of the interaction between the solvent molecules and the 2D layer. Here, we use density functional theory calculations to determine the adsorption configuration and binding energy of a variety of common solvent molecules, both polar and non-polar, on two of the most popular 2D materials, namely, graphene and MoS2. We show that these molecules are physisorbed on the surface with negligible charge transferred between them. We find that the adsorption strength of the different molecules is independent of the polar nature of the solvent. However, we show that the molecules induce a significant charge rearrangement at the interface after adsorption as a result of polar bonds in the molecule.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
15/SIRG/3314
Author's Homepage:
http://people.tcd.ie/mccaffnDescription:
PUBLISHED
Author: Caffrey, Nuala; Patil, Urvesh
Type of material:
Journal ArticleSeries/Report no:
The Journal of Chemical Physics;149;
Availability:
Full text availableKeywords:
2D materials, Graphene, Van der Waals forces, Transition metal chalcogenides, Adsorption, Solvents, Density functional theory, PhysisorptionSubject (TCD):
Nanoscience & Materials , NANOSTRUCTURESDOI:
https://doi.org/10.1063/1.5042524Metadata
Show full item recordLicences: