Fig. 25. (a) Relative resistance change of the MXene/PDMS flexible sensor during stretching; (b) relative resistance change of the MXene/PDMS flexible sensor when the elbow is bent; (c) current change of the MXene/PDMS flexible sensor when recognizing different words; (d) current change of the MXene/PDMS flexible sensor during swallowing⁸³ (Copyright 2020, The American Chemical Society).