Fig. 3. Shape-reprogramming. (a) Blank SMP was stretched to ε = 100% at 120 °C and then patterned with pattern-1 in dopamine solution (the black rectangle represents the top side and the gray rectangle represents the bottom side). (b) Irradiation of the patterned sample for 15 s. (c) Heating for 15 s at 120 °C while stretching to recover the flat shape. (d) Erasing the PDA pattern with 0.1 M NaOH aqueous solution. (e) Patterned with pattern-2 in dopamine solution. (f) Irradiation of the patterned sample for 15 s. (g) Heating for 20 s at 120 °C while stretching to recover the flat shape. (h) Erasing the PDA pattern with 0.1 M NaOH aqueous solution and back to the blank sheet. Light intensity: 1.4 W cm^–2. Scale bars: 0.5 cm.