Highly Sensitive and Robust Fiber Strain Sensor via Multiple Coating

초록

We report a highly sensitive and durable fiber-type strain sensor (SCDC) fabricated via scalable dip-coating method using a styrene-isoprene-styrene (SIS)-modified multi-walled carbon nanotube (MWCNT) dispersion, stabilized with poly(3-dodecylthiophene) (P3DDT) to ensure uniform coating and prevent CNT aggregation. By optimizing the number of dip-coating cycles, five iterations were identified as ideal, resulting in a wide strain range of 54.7%, high linearity (R2 = 0.972), and a stable gauge factor of 6.69. The sensor demonstrates excellent mechanical durability, with a consistent resistance response after 1,000 cycles under 30% strain and a low hysteresis ratio of 13.76%. When integrated into a wearable sleeve, the sensor reliably captured elbow motion with clear signal differentiation. This simple yet effective dip-coating strategy enables seamless integration of strain sensors into textiles, maintaining mechanical compliance without additional post-processing-paving the way for practical, garment-embedded e-textile applications.

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