Adhesive, Transparent Tannic Acid@ Sulfonated Lignin-PAM Ionic Conductive Hydrogel Electrode with Anti-UV, Antibacterial and Mild Antioxidant Function

Abstract

Inspired by mussel adhesion chemistry and ion electronics, a novel Ca²⁺-tannic acid@ sulfonated lignin-polyacrylamide (TA@SL-PAM) hydrogel was prepared via Ca²⁺-TA@SL composites and the PAM system, where a Ca²⁺-TA@SL composite was fabricated via TA doping with SL and the subsequent adsorption of Ca²⁺. The properties of the hydrogel were thoroughly investigated and the hydrogel was presented as multifunctional. The introduction of Ca²⁺-TA@SL composites endowed the hydrogel with excellent conductivity, adhesion and ultraviolet (UV) resistance, and improved antioxidant and antibacterial properties. More importantly, the Ca²⁺-TA@SL-PAM hydrogel electrode could accurately detect physiological signals of human (e.g., electrocardiogram (ECG), electromyography (EMG).

Keywords: PAM; electronic materials; functional; sulfonated lignin; tannic acid.