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<p>In this study, a polyvinyl alcohol/polyacrylamide/carbon nanotubes (PVA/PAAm/CNTs) conductive hydrogel film was prepared through a simple one-pot precursor solution-casting route. The PVA/PAAm/CNTs composite hydrogel exhibited an interconnected porous network, and CNTs were dispersed within the hydrogel matrix to form continuous conductive pathways. The strain-sensing performance of the hydrogel sensor was systematically investigated. The sensor showed a high gauge factor of 6.34 in the low-strain range of 0–10% and low electrical hysteresis of 0.3% ± 0.2% (mean ± SD), indicating good sensitivity and cyclic response stability. The sensor was further applied to human joint motion monitoring and object-grasping recognition, demonstrating its capability to capture dynamic strain signals under wearable conditions. In addition, a proof-of-concept comparison of knee flexion–extension between one healthy volunteer and one stroke patient showed that the sensor could record representative differences in motion amplitude and signal patterns. These results suggest that the PVA/PAAm/CNTs conductive hydrogel sensor has potential for wearable motion monitoring and rehabilitation-oriented signal acquisition, although larger-scale subject studies are still required for clinical validation.</p>

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Preparation of PVA/PAAm/CNTs conductive hydrogel strain sensors for grasping recognition and rehabilitation-oriented motion monitoring

  • 期刊论文

  • 发表日期：

    2026年7月16日

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  • Yuhong Zhang,
  • Renjie Wu

摘要

In this study, a polyvinyl alcohol/polyacrylamide/carbon nanotubes (PVA/PAAm/CNTs) conductive hydrogel film was prepared through a simple one-pot precursor solution-casting route. The PVA/PAAm/CNTs composite hydrogel exhibited an interconnected porous network, and CNTs were dispersed within the hydrogel matrix to form continuous conductive pathways. The strain-sensing performance of the hydrogel sensor was systematically investigated. The sensor showed a high gauge factor of 6.34 in the low-strain range of 0–10% and low electrical hysteresis of 0.3% ± 0.2% (mean ± SD), indicating good sensitivity and cyclic response stability. The sensor was further applied to human joint motion monitoring and object-grasping recognition, demonstrating its capability to capture dynamic strain signals under wearable conditions. In addition, a proof-of-concept comparison of knee flexion–extension between one healthy volunteer and one stroke patient showed that the sensor could record representative differences in motion amplitude and signal patterns. These results suggest that the PVA/PAAm/CNTs conductive hydrogel sensor has potential for wearable motion monitoring and rehabilitation-oriented signal acquisition, although larger-scale subject studies are still required for clinical validation.