fig1

Figure 1. (A) Schematic illustration of the synthesis process and crosslinked structure of the PAM/COS@SIW hydrogel; (B) FTIR spectra of AM, COS@SIW, PAM and PAM/COS@SIW hydrogels; (C) SEM image and (D) the corresponding EDS mapping of the PAM/COS@SIW hydrogel; (E) HRTEM image of the PAM/COS@SIW hydrogel; (F-H) Schematic representations of the remarkable properties of PAM/COS@SIW hydrogel, including excellent toughness (F), outstanding stretchability (G), and pronounced notch insensitivity (H); (I) Schematic application of the PAM/COS@SIW hydrogel in human motion monitoring. PAM: Polyacrylamide; COS: chitosan oligosaccharide; SIW: silicotungstic acid; FTIR: Fourier transform infrared spectroscopy; AM: acrylamide; SEM: scanning electron microscopy; EDS: energy-dispersive X-ray spectroscopy; HRTEM: high-resolution transmission electron microscopy; APS: ammonium persulfate.