Figure 1.

a) Scheme for the preparation of imperceptible electronic conductors: the 1.4 μm PET foil is mounted on a reusable support with a PDMS adhesion layer. After planar processing of the electrodes and peeling, the skin-spired electronic device is ready to use. b) Ultrathin capacitor foils on rolls form the technology platform for large-area sensor and electronic circuits. Scale bar: 10 cm. c) Photograph of the ultrathin electronic film floating on a soap bubble. Scale bar: 5 mm. d) TCR sensor array conformably coating a PCB board for temperature monitoring. Scale bar: 5 mm. e) Hybrid rigid RGB LED islands connected with stretchable conductors, formed by transferring the electrode stripes onto a pre-stretched elastomer, survive twisting and stretching. Scale bar: 1 cm.