To address the issues of traditional hydrogel-based electronic skin

such as poor mechanical properties (due to insufficient cross-linked network strength)

proneness to swelling

poor stability

and multi-signal crosstalk

which make it difficult to meet the requirements for device durability

stability

and high sensitivity in complex scenarios

the preparation and application of high-sensitivity conductive hydrogel-based flexible electronic skin via 3D printing are investigated.Using gelatin(Gel) as the matrix

sodium alginate (SA) and acrylamide (AM) are introduced

and the AM/SA/Gel composite hydrogel is prepared via temperature-induced

ion-induced

and photon-induced triple-network crosslinking

with a maximum tensile strain of 370% and significantly improved compressive strength.The sensor fabricated by optimizing the extrusion-based 3D printing process (with a layer thickness of 100μm

in-situ ultraviolet crosslinking

and calcium chloride reinforcement) can sensitively monitor human movements (with a resistance change rate of 70% for arm bending

110% for leg movement

and 14% for mouth opening and closing) and recognize external stress.This material shows significant potential in the field of wearable devices;future efforts should focus on balancing conductivity and ductility

improving stability

and promoting multi-material integration.