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In 2D materials, the large ratio of surface area to volume renders them promising for gas sensors. In addition, the unique supplementary advantages of phosphorene, like its in-plane anisotropy, structural stability, and high chemical reactivity with molecules, make it highly desirable as a superior gas sensor [61]. Indeed, under gases exposition, phosphorene undergoes multiple modifications [25]. For example, the gas molecules adsorption on phosphorene leads to a reduction or an increase of the resistance that is very required for the markers in sensing applications. Furthermore, phosphorene depends mainly on certain toxic gases because of the high binding strength gas molecules. As a result, the selective behavior of the phosphorene in adsorbing gases influences significantly its transport properties along the two axis directions [61].