Density functional theory study of adsorption of ionic liquids on graphene oxide surface

Electronic analysis of 1-ethyl-3-methyl imidazolium halide adsorption on AlN nanoflakes

This study explores the interaction of AlN nanoflakes with ionic liquids (ILs) consisting of 1-ethyl-3-methylimidazolium cations and halide anions (fluoride, chloride, bromide), aiming to enhance AlN nanoflake performance in energy applications. ILs adsorb onto the nanoflake surface, with halide ions attaching to aluminum atoms, indicating strong interactions that improve the material's electronic properties. Adsorption energy is the highest for fluoride and lowest for chloride, reflecting the strength and proximity of interaction. Thermodynamic analysis shows the adsorption is exothermic, with fluoride exhibiting the most substantial interaction due to its small size and high electronegativity. This significantly alters the electronic properties of the nanoflake, increasing dipole moment, redistributing charge, and reducing the HOMO-LUMO gap. Additionally, the enhanced nonlinear optical (NLO) properties make these IL-modified AlN nanoflakes promising candidates for energy storage and optical applications. These changes suggest improved conductivity and potential for enhanced supercapacitor performance, offering valuable insights for optimizing AlN nanoflakes in energy storage.

The Influence of Ionic Liquids Adsorption on the Electronic and Optical Properties of Phosphorene and Arsenene with Different Phases: A Computational Study

Density functional theory (DFT) calculations have been performed to investigate the interfacial interactions of ionic liquids (ILs) on the α- and β-phases of phosphorene (P) and arsenene (As). Nine representative ILs based on the combinations of 1-ethyl-3-methylimidazolium ([EMIM]⁺), N-methylpyridinium ([MPI]⁺), and trimethylamine ([TMA]⁺) cations paired to tetrafluoroborate ([BF₄]⁻), trifluoromethanesulfonate ([TFO]⁻), and chloridion (Cl⁻) anions were used as adsorbates on the 2D P and As nanosheets with different phases to explore the effect of IL adsorption on the electronic and optical properties of 2D materials. The calculated structure, adsorption energy, and charge transfer suggest that the interaction between ILs and P and As nanosheets is dominated by noncovalent forces, and the most stable adsorption structures are characterized by the simultaneous interaction of the cation and anion with the surface, irrespective of the types of ILs and surfaces. Furthermore, the IL adsorption leads to the larger change in the electronic properties of β-phase P and As than those of their α-phase counterparts, which demonstrates that the adsorption properties are not only related to the chemical elements, but also closely related to the phase structures. The present results provide insight into the further applications of ILs and phosphorene (arsenene) hybrid materials.