Highly Conductive Flexible Electrode Based on Liquid Metal@MOF Coated Hydrogel for Muscle and Multi-Scenario Heart Signal Monitoring

The mechanical stability of flexible electronic materials and their adaptability to diverse application scenarios constitute key bottlenecks limiting their practical deployment. To overcome these challenges, this study presents an innovative strategy for fabricating liquid metal composites by enabling efficient integration of MOF-Zn1 and liquid metal through ultrasonic cell disruption, followed by roller coating to fabricate flexible electronic patches on gelatin-based substrates. Experimental results demonstrate that this approach substantially enhances the overall performance of the material. The tensile strength of the gelatin substrate increases by a factor of 220 compared to the pristine material, retaining a strength of 12.68 MPa after 20 cycles in a 40% salt solution. The LM@MOF-Zn1 composite achieves an electrical conductivity of 2.5 × 10⁶ S/m while also exhibiting improved environmental stability, thermal stability, and self-healing capability. At the application level, the flexible electronic patch enables reliable electrocardiogram monitoring and accurate electromyogram signal acquisition across various physiological conditions and dynamic movement patterns. By innovatively integrating material design with processing techniques, this work provides a promising alternative to conventional metal-matrix composites.