Fig. 6. Ternary anti-faking temperature-switchable QR codes.
a The initial isotropic state. b1 The randomly distributed BPIII domains and configurations of BPIII/BPII, BPIII/BPI, and BPIII/BPII/BPI in Stage III are obtained at 76.7 °C. b2 The corresponding binary QR code transferred from b1. c The BPIII/BPII/BPI core-shell configurations in Stage IV obtained at c1 76.3 °C and c1’ 75.8 °C in the first cooling process. c2, c2’ The corresponding binary QR codes transferred from c1, c1’. d The isotropic state in the second cooling process. e1, e1’ The BPIII/BPII/BPI core-shell configurations in Stage IV observed at e1 76.3 °C and e1’ 75.8 °C. e2, e2’ The corresponding binary QR codes transferred from e1, e1’. f1 The BPIII/BPII/BPI core-shell configurations with high thermal stability by polymer-stabilizing the textures in low-temperature mode e2. f2–f3 The binary and ternary QR codes transferred from the POM image f1 using the same methods shown in Fig. 5. “Poly. Stab.” refers to “polymer stabilization”.