In the subsequent subsections, we will discuss the effect of the adsorption of different gas molecules on the electronic and magnetic properties of pristine ZGNRs. The role of charge transfer in modulating the properties of pristine ZNGRs. Then, the effect of gas molecules on the transport properties of pristine ZGNRs will be discussed. At last, we will discuss the spin-current properties of gas molecule-adsorbed ZGNRs.