fig1

Figure 1. Novel mechanical structures and applications of super-elastic/flexible freestanding ferroelectric thin films. Novel mechanical structures include 2D bending (Left : reprinted with permission^[61]. Copyright 2019, The American Association for the Advancement of Science. Right: reprinted with permission^[62]. Copyright 2020, AIP Publishing), 2D zigzag-wrinkling (Top: reprinted with permission^[63]. Copyright 2020, Wiley-VCH. Bottom: reprinted with permission^[64].Copyright 2022, American Chemical Society), 2D toroidal-wrinkling (reprinted with permission^[65]. Copyright 2021, The American Association for the Advancement of Science), and 3D twisting (reprinted with permission^[66]. Copyright 2022, Wiley-VCH) structures. Flexible applications include non-volatile memories (reprinted with permission^[67]. Copyright 2013, Wiley-VCH), flexible displays (reprinted with permission^[68]. Copyright 2004, Elsevier), nano-sensors (reprinted with permission^[69]. 2018, CC BY license), health monitors (reprinted with permission^[70]. Copyright 2016, Wiley-VCH), nano-generators (reprinted with permission^[71]. Copyright 2020, American Chemical Society), and energy harvesters (reprinted with permission^[72]. 2016, CC BY license).