Deep Eutectic Organogel with Superior Stability, Self-Healing, and Adhesion for Motion Detection and Intelligent Sleep Staging

Flexible wearable electronics integrated with deep learning algorithms have exhibited tremendous potential for long-term personalized health monitoring. However, conventional hydrogel-based sensing electrodes are plagued by inevitable dehydration, poor low-temperature tolerance, and severe motion artifacts, which greatly restrict their long-term service stability and signal fidelity. Herein, we develop a highly stable and multifunctional deep eutectic organogel by in situ polymerization of acrylamide and sodium acrylate within a ternary deep eutectic solvent (DES) system, incorporating polyvinylpyrrolidone (PVP)-stabilized carboxylated multiwalled carbon nanotubes (MWCNT-COOH) as conductive fillers. The as-prepared organogel exhibits outstanding long-term antidehydration performance (only 4.05% weight loss after 31 days), excellent low-temperature resistance (no freezing at −76 °C), and universal interfacial adhesion to diverse substrates. Benefiting from the dynamic coordination bonds and dense hydrogen-bonding networks, the eutectogel achieves remarkable stretchability (up to 880% strain), favorable mechanical strength, rapid self-healing performance, and reliable cyclic stability. Moreover, the eutectogel-based strain sensor demonstrates high sensitivity, fast response, and excellent durability in detecting diverse human motions ranging from subtle swallowing behaviors to large-scale limb movements. More importantly, the organogel electrode enables stable, high-fidelity electrocardiogram (ECG) monitoring for four consecutive nights without obvious signal attenuation. Assisted by a one-dimensional convolutional neural network with a bidirectional gated recurrent unit (CNN-BiGRU) deep learning model, the system realizes accurate intelligent sleep staging (average accuracy up to 93%) for wakefulness, light sleep, and deep sleep stages. This work provides a promising strategy for designing high-performance deep eutectic polymer gels and demonstrates their great potential in flexible wearable electronics, healthcare monitoring, and intelligent diagnostics.