Fig. 7
From: Transfer printing techniques for flexible and stretchable inorganic electronics
Aphid-inspired transfer printing techniques: inflatable stamp. a Image of an aphid and structure of the aphid adhesion system. (1) Optical image of an aphid clinging to a flat surface; (2) Aphid adhesion organ (pulvillus) is everted to drive the mechanical sagging of the pulvillus and enlarge the contacting area, resulting in strong adhesion. (3) Aphid adhesion organ (pulvillus) is withdrawn by contraction of tibial muscles, which drives the retraction of the pulvillus and diminishes the contacting area, leading to weak adhesion. b Transfer printing technique using an inflatable stamp: (1) Transfer printing process; (2) Experimentally and theoretically predicted decrease in stamp/silicon interfacial adhesion (maximum pull-off force) with the inflation pressure and (3–6) capacity demonstrations of transfer printing. Adapted with permission from ref. 91
