CO and H2S-adsorbed 1D AlSi structures for gas sensing applications

Employing density functional theory (DFT) in conjunction with the Vienna Ab initio Simulation Package (VASP), this study systematically investigates the electromagnetic and optical characteristics of pristine one-dimensional (1D) AlSi structures (AlSi nanoribbons or AlSiNRs), as well as those of AlSiNRs adsorbing CO and H2S gases. The AlSiNRs under scrutiny exhibit a width of five atoms. Notably, the investigated structures exhibit metallic and magnetic attributes, with the introduction of CO and H2S altering the magnetism of the system. Analysis of the partial density of states reveals multi-orbital hybridizations, resulting in the formation of σ and π bonds that contribute to stabilizing the hexagonal structure of the system. Optical properties are delineated through the depiction of the real and imaginary components of the dielectric function, alongside the adsorption coefficient and electron-hole density. Remarkably, the research indicates that the structures manifest optical transparency when subjected to photon energies exceeding approximately 12.42 eV. These findings underscore the potential utility of the investigated structures in nanotechnological applications, particularly in the realm of CO and H2S gas sensing.

Methods
Using density functional theory and VASP software to study the electrical, magnetic and optical properties of material structures.