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Schematic diagrams of flexible strain/pressure sensors using various materials: (a) polyaniline nanofibers and the conductive layer of Au (reproduced with permission from [85]); (b) carbon nanotube–reinforced hydrogel (reproduced with permission from [107]); (c) CS–PHEAA DN hydrogel (reproduced with permission from [108]); (d) Ti3C2Tx MXene/carbon nanotube composite (reproduced with permission from [110]).
