This PDF file includes:

• fig. S1. Characterization of MXene (Ti₃C₂T_x) nanosheets.
• fig. S2. Tensile fracture behaviors of pristine hydrogel.
• fig. S3. Schematics of the uniformly dispersed polymer-clay network structure of M-hydrogel.
• fig. S4. Experimental setup for electromechanical responses of M-hydrogel under compression.
• fig. S5. Electromechanical response of M-hydrogel to vertical motion of object on its surface.
• fig. S6. Anisotropic electric response of M-hydrogel to tensile and compressive strain.
• fig. S7. Motion direction sensing comparison between the pristine hydrogel and M-hydrogel.
• fig. S8. Mechanism of the speed-sensitive property of M-hydrogel.
• fig. S9. Handwriting and vocal sensing performances of pristine hydrogel.
• table S1. GF comparison between the M-hydrogel (4.1 wt %)–based sensor and recently reported hydrogel-based sensors.
• References (36, 37)

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Other Supplementary Material for this manuscript includes the following:

• movie S1 (.avi format). Stretchability and self-healability of M-hydrogel.
• movie S2 (.avi format). Stretchability and self-healability of pristine hydrogel.
• movie S3 (.avi format). Tensile fracture demonstration of M-hydrogel.
• movie S4 (.avi format). Tensile fracture demonstration of pristine hydrogel.
• movie S5 (.avi format). In situ TEM observation with varying tilt angle.
• movie S6 (.avi format). In situ TEM observation with varying depth of focus.