Carboxymethylcellulose-Based Dual-Network Ion-Conducting Hydrogel for Flexible Strain Sensors

In this paper, carboxymethyl cellulose/polyacrylamide single network hydrogel was immersed in ferric ion solution to prepare dual-network ionic conductive hydrogel. The tensile strength, elongation, and conductivity of the hydrogel can reach 1.01 MPa, 411%, and 3.11 S/m respectively. Its super mechanical properties, excellent electrical conductivity, and stable sensing properties can convert external mechanical signals into stable electrical signal output. Carboxymethylcellulose-based double network ion-conducting hydrogels were further used as flexible substrates to assemble flexible sensor devices. Hydrogel sensors can monitor both simple joint movements and complex spatial movements and have potential application value in the research fields of intelligent response electronic devices such as flexible wearable devices and soft robots.