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<p>Instantaneous monitoring of human motion is prominent for advancing healthcare and human–machine interaction. However, fabricating flexible strain sensors that integrate high sensitivity, broad detection range, and biodegradability via a one-step process remains challenging. Here, we propose a one-step wet electrospinning strategy to develop a biodegradable sensor using poly(L-lactide-co-<i>ε</i>-caprolactone) (PLCL) and multi-walled carbon nanotubes (MWCNTs). By directly electrospinning PLCL into an MWCNT-loaded coagulation bath, the MWCNTs are uniformly anchored onto fiber surfaces through electrostatic and van der Waals interactions, eliminating the need for post-treatments. This simplified process enables: Ultrahigh sensitivity (gauge factor = 968.8) and exceptional stretchability (<i>ε</i> &gt; 800% strain), Robust durability (&gt; 5000 cycles) with a low detection limit (0.08%), controllable biodegradability via PLCL/MWCNT composite design. The sensor precisely detects diverse motions, from subtle throat vibrations to large joint bending angles (30°–90°), demonstrating its potential for wearable health monitoring and intelligent robotics. Importantly, this work provides a low-cost, scalable fabrication paradigm for high-performance flexible electronics, while addressing environmental concerns through material degradability.</p>

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Carbon nanotube-modified biodegradable poly(L-lactide-co-ε-caprolactone) (PLCL) fiber networks for motion detection systems

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Zichen Yuan,
  • Haotian Cheng,
  • Kecheng Li,
  • Ruoxi Lyu,
  • Yingzheng Lyu,
  • Xiaofeng Wang,
  • Qian Li

摘要

Instantaneous monitoring of human motion is prominent for advancing healthcare and human–machine interaction. However, fabricating flexible strain sensors that integrate high sensitivity, broad detection range, and biodegradability via a one-step process remains challenging. Here, we propose a one-step wet electrospinning strategy to develop a biodegradable sensor using poly(L-lactide-co-ε-caprolactone) (PLCL) and multi-walled carbon nanotubes (MWCNTs). By directly electrospinning PLCL into an MWCNT-loaded coagulation bath, the MWCNTs are uniformly anchored onto fiber surfaces through electrostatic and van der Waals interactions, eliminating the need for post-treatments. This simplified process enables: Ultrahigh sensitivity (gauge factor = 968.8) and exceptional stretchability (ε > 800% strain), Robust durability (> 5000 cycles) with a low detection limit (0.08%), controllable biodegradability via PLCL/MWCNT composite design. The sensor precisely detects diverse motions, from subtle throat vibrations to large joint bending angles (30°–90°), demonstrating its potential for wearable health monitoring and intelligent robotics. Importantly, this work provides a low-cost, scalable fabrication paradigm for high-performance flexible electronics, while addressing environmental concerns through material degradability.