Multifunctional Conductive Fabrics for Human Motion Monitoring and Electromagnetic Protection

The rapid development of wearable electronics demands multifunctional materials that can simultaneously mitigate electromagnetic interference (EMI) and enable real‐time human motion monitoring. Herein, we reported a mussel‐inspired ferric ion (Fe 3+ )‐PDA co‐deposition method to modify basalt fiber (BF) fabric, followed by spray‐coating of carbon nanotubes (CNTs) onto the fabric surface. The Fe 3+ ‐PDA coating not only significantly improved the interfacial adhesion of CNTs but also introduced polar groups and metal–ligand charge transfer complexes that enhanced the dielectric loss. The resulting PCBF‐8 fabric exhibited an EMI shielding effectiveness (SE) of 34.7 dB. The specific SE of single‐layer PDBF‐8 fabric can reach up to 1917.78 dB/cm, surpassing many reported composites. It also produced distinct signal characteristics in response to various joint motions (finger: 1.03% Δ R / R 0 ; wrist: 5.47%; elbow: 16.78%; knee: 17.94%). Moreover, the fabric showed good environmental durability: after 7 days of sunlight exposure, the EMI SE retained approximately 90.6% of its original value. After immersion in 1 mol/L HCl and NaOH for 3 h, the SE decreased from 9.11 to 7.16 and 5.68 dB, respectively, confirming its robustness under harsh chemical conditions. This study displayed that a single conductive network can concurrently achieve static EMI protection and dynamic motion perception, offering a promising strategy for next‐generation smart wearables.