Dual-bioinspired hierarchically structured superhydrophobic and conductive nanocomposite films for ultrasensitive and reliable strain sensing

作者：Yuyue Wu, Demei Kong, Yali Gu, Li‐Dong Peng, Zhao Li, Zuan‐Yu Chen, Cheng‐Fei Cao, Yang Li, Guodong Zhang, Jiefeng Gao, Kun Cao, Joonho Bae, Yongqian Shi, Long‐Cheng Tang · 发表于：Nano Materials Science · 年份：2025 · DOI：10.1016/j.nanoms.2025.07.002 · 被引用次数：5 · 研究领域：Advanced Sensor and Energy Harvesting Materials、Gas Sensing Nanomaterials and Sensors、Conducting polymers and applications

Flexible wearable strain sensors (FWSSs) have promising applications in many emerging fields, such as artificial intelligence and health care. However, current FWSSs are limited by their inadequacy in large deformation detection, poor cyclic performance, and unsuitability in harsh environments. Here, we proposed a novel “sanding-swelling-anchoring and two-step curing (SSA&TC)” strategy dual-inspired by agricultural “plowing-irrigation-planting” practices combined with spider-inspired structures to fabricated a hierarchically structured superhydrophobic and conductive CNT/PDMS film. A unique conductive layer is firmly constructed into the PDMS surface by adjusting the swelling degree, CNT specifications, and two-step curing process, forming the micro-/nano-ingenious structures of crisscross micro-cracks and hair-like CNT layer. Consequently, the optimized nanocomposite film exhibits excellent super-hydrophobicity (water contact angle of ∼170°), ultrasensitive sensing performance (Gauge factor of 5 270 at 200% to 36% strain), fast response ability (response/recovery time of 99/77 ms), and wide strain range (0.5% to 366%). Further, excellent cyclic stability and reliable strain sensing behaviors of the CNT/PDMS films under various stress modes or harsh conditions demonstrate their strong potential for diverse strain-sensing applications, exhibiting reliably high sensitivity and stability.