▎ 摘　　要

We propose a regioselective unzipping and cutting of strained graphene by oxidation to form graphene nanoribbons (GNRs) of controllable width with well-defined and smooth edges at low temperature. The proposed process is based on first-principles calculations involving a uniaxial external compressive strain along the armchair direction. The process consists of three steps: (i) compressive strain engineering of graphene into periodic ID sinusoidal ripple patterns, (ii) oxidation of a strained ripple, which leads to the unzipped graphene ripple with curvature-directed linear alignment of ether chains along the zigzag (ZZ) directions perpendicular to the strain, and (iii) subsequent further oxidation of the highly ordered unzipped ripple, which cuts it into uniform-width ZZ-GNRs. This method offers a potentially high level of control of the ZZ-GNRs width at low temperature.