Figure 3.

MXenes for strain sensor. (A) Fabrication process of a sandwich-like Ti₃C₂T_x MXene/CNT layer; (B) SEM images of sandwich-like Ti₃C₂T_x MXene/CNT layers. (C) Relative resistance responses of the sensor in phonation and motion; (A–C) are reproduced from Cai et al. (2018) with permission from American Chemical Society. (D) Schematic illustration of the Ti₃C₂T_x-AgNW-PDA/Ni²⁺ sensor based on the “brick-and-mortar” architecture; reproduced from Shi et al. (2019) with permission from American Chemical Society. (E) Schematic illustration of the mechanism of the electromechanical responses of M-hydrogel; (F) Schematic for vocal sensing and (G) Resistance change in response to similarly sounding letters “B.” (E–G) are reproduced from Zhang et al. (2018).