A Density Functional Study of the Adsorption of Carbon Dioxide Molecule on Graphene
DOI:
https://doi.org/10.15407/ujpe58.09.0841Keywords:
graphene, adsorption, density functional theory, CO2Abstract
The physisorption of a CO2 molecule on a graphene sheet using ab initio density functional theory is investigated. The geometrical structure of graphene, including various parameters viz. the bond lengths and bond angles are calculated for a graphene sheet under the adsorption of a CO2 gas. Additionally, the density of states of a graphene sheet is calculated with & without adsorption of CO2 molecules. It is observed that the CO2 molecule is adsorbed on the graphene sheet with the adsorption energy of about 61.7 meV or less. The HOMO-LUMO energy levels of the graphene sheet before and after the adsorption of a CO2 molecule remain unaltered. Therefore, the graphene sheet cannot detect a CO2 molecule owing to their weak interaction.
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