Degradable Supramolecular Eutectogel-Based Ionic Skin with Antibacterial, Adhesive, and Self-Healable Capabilities

Thedevelopment of degradable, cost-effective, and eco-friendlyionic conductive gels is highly required to reduce electronic wasteoriginating from flexible electronic devices. However, biocompatible,degradable, tough, and durable conductive gels are challenging toachieve. Herein, we develop a facile strategy for the design and synthesisof degradable tough eutectogels by integrating an electrostaticallydriven supramolecular network composed of branched polyacrylic acid(PAA) and monoethanolamine (MEA) into a green deep eutectic solventwith chitosan quaternary ammonium salt (CQS). The specially designedPAA/MEA/CQS eutectogels present multiple desired properties, includinghigh transparency, widely adjustable mechanical properties, high resilience,reliable adhesiveness, excellent self-healing ability, good conductivity,remarkable anti-freezing performance, and antibacterial properties.The dynamic and reversible supramolecular interactions not only significantlyenhance the mechanical properties of the PAA/MEA/CQS eutectogels butalso enable fast degradation, addressing the dilemma between mechanicalstrength and degradability. More importantly, a biocompatible anddegradable multifunctional ionic skin is successfully fabricated basedon the PAA/MEA/CQS eutectogel, exhibiting high sensitivity, a widesensing range, and a rapid response speed toward strain, pressure,and temperature. Thus, this study offers a promising strategy forfabricating degradable tough eutectogels, which show great potentialas high-performance ionic skins for next-generation flexible wearableelectronic devices.