Ultrathin, Graphene‐in‐Polyimide Strain Sensor via Laser‐Induced Interfacial Ablation of Polyimide

Abstract Laser‐induced graphene sensors have attracted considerable interest in various fields; however, the low sensitivity and conformability limit their further applications measuring soft, large deformable structures. Here, an innovative method of interface ablation is presented to convert interfacial polyimide into by nanosecond ultraviolet laser (308 nm). Significantly different from traditional surface ablation, demonstrates its unique capacity produce high‐quality with limited depth, which benefits combined effect highly concentrated temperature distribution, confinement reaction product, a mode dominated heat conduction. Using this method, ultrathin (8 µm), graphene‐in‐polyimide (GiP) strain sensor obtained, six times thinner than that prepared ablation. The GiP exhibit excellent (small bending radius 400 high (24.8), force (4.2 N −1 ). Demonstrations deformation measurement morphing aircraft (e.g., bending, twisting, impact) illustrate powerful abilities health monitoring equipment, thus providing engineering opportunities for smart devices requiring accurate measurement.