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<p>Flexible pressure sensors have demonstrated significant potential for applications in human behavior monitoring and human–machine interaction. Traditional piezoresistive flexible pressure sensors have primarily focused on enhancing sensitivity, often neglecting the durability and mechanical properties of the sensor. To address this issue, the present study introduces an innovative CNTS/CB-PDMS conductive coating and employs commercially available polyurethane (PU) sponge as the substrate, aiming to ensure that the flexible pressure sensor achieves both high sensitivity and excellent recyclability and mechanical performance. PDMS serves not only as the dispersing medium for CNTS/CB but also as an adhesive, bonding the conductive sensing materials to the three-dimensional skeletal structure of the sponge during the curing process, thereby enhancing the sensor’s recyclability. The fabricated sensor exhibits high sensitivity across a wide pressure range (0–50&#xa0;kPa), with the highest sensitivity reaching (0.112 ± 0.005) kPa⁻<sup>1</sup> in the 0–10&#xa0;kPa range. It demonstrates a response time of (182 ± 15) ms, a recovery time of (53 ± 7) ms, and long-term cycle stability exceeding 20,000 cycles. The sensor shows promising application prospects for monitoring subtle activities such as joint movement and swallowing.</p>

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High-sensitivity piezoresistive pressure sensor with a coated CNTS/CB-PDMS conductive layer on polyurethane sponge

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • Xuesong Jia,
  • Tao Xue,
  • Qiang Zou

摘要

Flexible pressure sensors have demonstrated significant potential for applications in human behavior monitoring and human–machine interaction. Traditional piezoresistive flexible pressure sensors have primarily focused on enhancing sensitivity, often neglecting the durability and mechanical properties of the sensor. To address this issue, the present study introduces an innovative CNTS/CB-PDMS conductive coating and employs commercially available polyurethane (PU) sponge as the substrate, aiming to ensure that the flexible pressure sensor achieves both high sensitivity and excellent recyclability and mechanical performance. PDMS serves not only as the dispersing medium for CNTS/CB but also as an adhesive, bonding the conductive sensing materials to the three-dimensional skeletal structure of the sponge during the curing process, thereby enhancing the sensor’s recyclability. The fabricated sensor exhibits high sensitivity across a wide pressure range (0–50 kPa), with the highest sensitivity reaching (0.112 ± 0.005) kPa⁻1 in the 0–10 kPa range. It demonstrates a response time of (182 ± 15) ms, a recovery time of (53 ± 7) ms, and long-term cycle stability exceeding 20,000 cycles. The sensor shows promising application prospects for monitoring subtle activities such as joint movement and swallowing.