DFT and MD study of adsorption sensitivity of aluminium phosphide nanotube towards some air pollutant gas molecules

To investigate the adsorption behaviour of CS₂, CO₂, SO₂, H₂Se and H₂S gas molecules on the external surface of (6, 0) single-walled aluminium phosphide nanotube (AlPNT), the density functional theory (DFT) calculations at the B3LYP level of theory are performed. The partial densities of states (PDOS) for the SO₂ molecule, the S and O atoms of SO₂ molecule before and after adsorption on the surface of AlPNT have been plotted. The vibrational frequencies and physical properties such as chemical potential, chemical hardness, dipole moment and chemical electrophilicity of all studied complexes have been systematically investigated. The electron density and the Laplacian of the electron density for bond critical points have been examined by the AIM theory. Also the molecular dynamics (MD) simulations of two complexes with the minimum and maximum negative interaction energies that is: AlPNT/CO₂ and AlPNT/SO₂ complexes, respectively, have been considered.