Density functional theory study of the adsorption and dissociation of OF2 and O3 gases on the surface of pristine and Al, Ti and Cr doped graphene

Abstract

In this research, we studied pristine (PGs) and Al, Ti, and Cr-doped graphene (DGs) via density functional theory calculations for adsorption of OF2 and O3 gas. Changes in the structural, electronic, and optical properties due to Al, Ti, and Cr-doping as well as gas adsorption have been studied. After doping with Al, Ti, and Cr atoms, the cohesive energies were −8.787, −8.754, and −8.768 eV, respectively, where the negative values indicate the structural stability of doped sheets. The OF2 adsorbed on the complexes of PGs, Ti-DGs, Cr-DGs, and Al-DGs showed strong adsorbate–adsorbent interaction with −0.468, −16.369, −11.096, and −9.158 eV adsorption energies, respectively. Similarly, for O3 gas, the adsorption energies of those sheets are −0.444, −10.575, −10.870, and −6.711 eV, respectively. From optical properties analysis, we found that the maximum reflectivity for gas-adsorbed Ti-DGs and Cr-DGs is found in the UV region, whereas the highest reflectivity for Ti-DGs and Cr-DGs is found in the visible range. Our studies reveal that all these DGs are good candidates for the adsorption and dissociation of OF2 and O3 gases.