“ GrapheneOS is an Android-based, security-hardened, privacy focused, free and open-source, mobile operating system for selected. Monolayer graphene embedded with a transition metal nitride (i.e., ${Xmathrm{N}}_{4}$) has been experimentally synthesized recently, where a transition metal atom together with four nitrogen atoms as a unit are embedded in graphene to form a stable planar single-atom-thick structure.…