Egg white/gelatin/carboxymethylcellulose superbly bonded and biocompatible flexible self-adhesive multifunctional sensor

The egg white (EW)-gelatin-sodium carboxymethylcellulose (CMC) hydrogel has excellent self-adhesive properties and can adhere stably to various material surfaces. Here, the EWg-CMC_0.3 hydrogel sensor was prepared with good self-adhesion (bond strength = 255 kPa), self-healing (25 min, HE = 224.5%), high swelling, strain sensing (sensitivity, GF = 0.74), stress sensing (3—7 kPa, GF = 0.019%/KPa), and temperature and humidity sensing capabilities, and the sensor demonstrated a stable signal at 20% strain for 500 cycles. This study provides good prospects for wearable, biocompatible, and edible electronic skin applications.