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Lead-free composites-based UWEH. a) Schematic of the lead-free UWEH device. b) Optical images of the lead-free UWEH device when standing freely and wrapped a vertically folded surface and a curved surface. c) Fabrication and microstructure of the lead-free composite component. d) Ex vivo test of the lead-free UWEH device. Reproduced with permission [103]. Copyright 2019, Wiley-VCH.
