Exploring adsorption mechanism of hydrogen cyanide and cyanogen chloride molecules on arsenene nanoribbon from first-principles.

The SIESTA package is employed in examining the electronic and adsorption features of the toxic asphyxiants hydrogen cyanide (HCN) and cyanogen chloride (NCCl) on armchair arsenene (As-arm) nanoribbon. Based on the generalized gradient approximation (GGA) with the Perdew-Burke-Ernzerhof (PBE) level of theory, we explored the adsorption of HCN and NCCl on As-arm nanoribbon. The significant parameters necessary to validate the electronic and stable nature of As-arm nanoribbon are computed with the help of formation energy and energy gap change. The density of states (DOS) spectrum and the energy band structure are figured-out for both isolated and asphyxiants adsorbed As-arm nanoribbon, which affirms the transfer of electrons taking place between As-arm nanoribbon and the asphyxiants. Also, surface assimilating properties like Bader charge transfer, average energy gap variation, and adsorption energy are calculated for the asphyxiants adsorbed As-arm nanoribbon. Moreover, the comparison is made between the electron density of isolated and asphyxiants adsorbed As-arm nanoribbon to enunciate the utilization of As-arm nanoribbon as a chemisensor for detecting the asphyxiants HCN and NCCl molecules.