An Integrated Self-Healable and Robust Conductive Hydrogel for Dynamically Self-Adhesive and Highly Conformable Electronic Skin
Mimicking the mechanical and sensory properties of human skin to develop a highly conformable electronic skin that integrated with robust, self-healable, and ultra-sensitive properties is promising but still a great challenge. In this work, we report a novel dynamic self-adhesive and self-healable conductive hydrogel material that is applicable to highly conformal and ultrasensitive electronic skin devices. In the obtained gel system, the incorporated tannic acid coated cellulose nanocrystals (TA@CNCs) acts as dynamic reinforcing bridges in the dual cross-linked gel network that mediated by reversible hydrogen bonds and electrostatic interactions, allowing an unique combination of superior mechanical performance (strain>700%) and reliable autonomous self-healing capability (HE>90%). The formation of conductive polyaniline (PANI) network in the obtained TC-Gel leads to both high conductivity (0.13 S/cm) and high sensitivity (GF=11.2), which are advantageous for the real-time detection of large human motions, tiny muscle movements, and physiological signals. Notably, the TC-Gel exhibits the dynamic self-adhesive performance that integrates with both strong adhesion (~440 N m-1) and easy detachment in water for 3 min. As a proof of concept, we demonstrate that this unique self-adhesive strategy is able to increase interface interlocking and conformal contact between TC-Gel based sensor and dynamic biological surface, contributing to the high sensory performance with a low noise level and negligible baseline ﬂuctuation. We envisage that this work broads a new avenue for designing the multifunctional cellulosic-based hydrogels to promote the application of integrated electronic skin with high sensory properties and comfortable user experiences.
- This article is part of the themed collection: 2019 Journal of Materials Chemistry C HOT Papers