Bioinspired MXene-Based Flexible and Degradable Membranes for High-Performance Electromagnetic Shielding

Wearable shielding electronic skin is highly desirable for protecting humans from electromagnetic radiation. However, conventional wearable electromagnetic interference (EMI) shielding materials still encounter major challenges in simultaneously achieving high shielding effectiveness, mechanical flexibility, and biocompatibility. Here, we report a flexible biocomposite membrane fabricated through the synergistic assembly of silk fibroin (SF) nanofibers and the two-dimensional conductive material MXene. The SF nanofibers regulate the stacking and spatial distribution of MXene lamellae via multiple hydrogen bonds, which markedly enhances electromagnetic wave attenuation, interfacial coupling, and oxidative degradability. The biocomposite membrane delivers an EMI SE of 63.64 dB, higher than that of the pure MXene membrane (approximately 50 dB), and the biocomposite membrane achieves an SSE/ t value as high as 3.15 × 10 4 dB cm 2 g –1 across a broad frequency range of 8–26.5 GHz, achieving outstanding EMI shielding performance together with oxidative degradability in 2% H 2 O 2 and excellent cytocompatibility. This study provides an avenue toward sustainable, high-performance wearable EMI shielding materials.