Heterogeneous Knitted Fabrics for 3D Flexible Capacitive Sensors With Enhanced Sensitivity and Durability

Herein, a 3D textile capacitive pressure sensor constructed from a heterogeneous double‐sided conductive knitted fabric and spacer dielectric layers, designed for plantar pressure monitoring. Using bidirectional jacquard knitting, a skin‐comfortable, flexible fabric with asymmetric conductivity was developed by incorporating a homemade conductive core‐spun yarn. The sensor was fabricated via hot‐melt bonding and polydimethylsiloxane encapsulation, with spacer fabric thickness systematically varied to tune pressure sensitivity. The sensor with a 2.36 mm dielectric layer exhibited optimal performance, including a high sensitivity, a response time of 6 s, a recovery time of 4 s, and a hysteresis of 12.93%. Long‐term durability was confirmed through 3000 cyclic loadings without significant signal degradation. The fully textile architecture preserves comfort and breathability while enabling reliable dynamic sensing. This work introduces a novel fabrication route and sensing architecture that advances textile‐integrated electronics and offers scalable potential for wearable health monitoring, soft robotics, and next‐generation smart‐garment applications.