Figure 1.

(a) Schematic illustration of the fabrication process of LIG electrodes; (b) photograph of the logo of Hainan University fabricated by LIG technique, and the photographs of LIG electrodes showing excellent flexibility; (c) photograph of a LIG sensor after modification with corresponding ion-selective membranes (black circles, left) and Ag/AgCl ink (silvery circles, right), which could simultaneously detect Na⁺, K⁺, and pH in sweat; (d) schematic illustration of the structures of Na⁺, K⁺, pH sensors, and Ag/AgCl reference electrodes; (e) SEM image and (f) Raman spectra of LIG layer.