Fig. 5.

Optical information storage and haptic sensor of TPE-4N thin film. a Procedures of the micro-embossing and recovery on the thin film of TPE-4N prepared by spin coating on quartz plate and luminescent photos of micro-embossed patterns. Process I: heated by a handed heat gun at 150 °C for 3 s; Process II: embossed with a mold with a width of 10 μm and a spacing of 10 μm. Scale = 200 µm. b Haptic photos of fingerprint on aluminum, ceramic, and wooden substrates coated with TPE-4N, i, freshly brush coated film; ii, annealed film; iii, pressed with finger. c, d Haptic sensor: luminescent photos c and grayscale intensity change d with the increasing finger pressure. Scale = 1 cm. All luminescent photos were taken under UV irradiation at 365 nm