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Two-dimensional polyaniline sheet has been recently synthesized and foundthat it is a semiconductor with indirect band gap. Polyaniline nanoribbonsdecomposed from two-dimensional polyaniline sheet (C3N sheet) are investigatedusing density functional theory. The existence of nitrogen atoms in the edge ofthe ribbons increases stability and magnetization of the ribbons and make themdifferent from graphene nanoribbons. Unsaturated nanoribbons are magneticmetals so that armchair C3N nanoribbons are gap-less spin semicon- ductors inthe antiferromagnetic state and half-metals in the ferromagnetic state. Atransition from metal to semiconductor is observed in the armchair C3Nnanoribbons when the edge atoms are passivated by hy- drogen. The band gap ofhydrogen saturated armchair C3N nanoribbons can be controlled using an externaltransverse electric field so that its magnitude is dependent on the directionof the electric field. Being metal or semiconductor in hydrogen saturatedzigzag C3N nanoribbons is strongly dependent on the edge atoms so that justribbons having nitrogen atoms in both edges are semiconductor. An externalelectric field cannot induce any spin polarization in the zigzag nanoribbonswhich is in contrast with what was observed in zigzag

Polyaniline (C_{3}N) nanoribbons: Magnetic metal, Semiconductor, and Half-Metal