Fig. 3: Stretching test of the 3D graphene-based spiral sensor.

It shows that the 3D graphene-based spiral sensor prepared by stretching the 2D graphene-based spiral sensor fabricated by laser kirigami. The resistance changes with the time of a continuous stretching test in a stretching cycle. The maximum stretching height reaches 21 cm. Laser speed 1%, power 0.3%, PPI 400.