Figure 12.

(A) Schematic diagram of the fabrication process of flexible zeolite fibers with high surface area based on core-shell structure. (B) Optical image of a zeolite fiber filter with a diameter of 7 cm [37]. Copyright 2018, Elsevier. (C) Optical images of prepared all-flexible LIB (I and II) lit up “LIB plate” (III,IV) and “stopwatch” (V–VII) in the flat and bent positions, respectively [99]. Copyright 2016, Elsevier. (D,E) Response curves of the pressure sensor during wrist bending/releasing and finger bending/releasing, respectively. (F) Schematic illustration of micropillar deformation during sensor bending. (G) A digital photo of the sensor attached to the wrist. (H,I) The human body’s electrocardiogram is detected by the pressure sensor fixed to the wrist. (I) showed one of the enlarged waveforms, which could accurately detect and clearly distinguish three typical peaks, namely, percussion wave (P waves), tidal wave (T waves), valley, and diastolic wave (D waves). P and T waves were related to blood pressure, while D waves represented heart rate [101]. Copyright 2019, John Wiley and Sons. (J) An optical photograph showing the consistency of the temperature sensor. When the wrist is bent, the sensor is laminated to the skin. (K) Demonstration of a stretchable temperature sensor. The illustration shows a sensor attached to the knuckle of a flexible rubber prosthesis, showing stable functionality during repeated finger bending [103]. Copyright 2018, Springer Nature.