fig1

Figure 1. Schematic illustration of the dual-mode wearable sensor. (A) Schematic illustration showing the dual-mode sensor working as a wearable device; (B) Structure and working mechanism of the dual-mode sensor; (C) (i-iii) Schematic illustration of the dual-mode sensor detecting (i) the sweat Na⁺, (ii) periodic pressure, and (iii) the two physiological signals simultaneously.