Simultaneously Achieving Ultra‐Stretchability and Biocompatibility in Electromagnetic Interference Shielding Materials Through a Biomimetic Strategy and MXene Enhancement

Abstract To enable applications in stretchable electronics, soft robotics, and bioelectronics, electromagnetic interference (EMI) shielding materials should combine high stretchability and biocompatibility long‐standing challenges in the field. Herein, EMI shielding materials are presented with excellent shielding effectiveness (86.6 dB, shield ≈99.9999997% incident electromagnetic waves), ultra‐stretchability (2000%–4000%), and biocompatibility. This is achieved through two key steps: first, substantially enhancing matrix stretchability using ultra‐stretchable conductive liquid metal microdroplets, via a bio‐inspired “fluidic core‐chain interface‐gel matrix” (FCCIG) strategy; second, activating EMI shielding by incorporating minimal but indispensable MXene (0.033–0.21 wt.%) to create a percolation network with minimal stretchability loss. Furthermore, the EMI shielding materials demonstrate superior multifunctional capabilities, including motion detection, temperature sensing, and antibacterial properties, alongside crucial fabrication attributes qualities rarely, if ever, achieved in a single EMI shielding material. These findings underscore the significant potential of this approach in advancing EMI shielding materials for stretchable biomedical electronics.