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<p>The creation of wearable sensors that achieve high sensitivity, flexibility, cost-effectiveness, and ease of fabrication is highly desirable but presents considerable challenges. Here we propose a low-cost and simple fabrication strategy to achieve an ultrasensitive and flexible sensor by paper-based microfluidics. The capacitive sensor consists of silver nanowire electrodes separated by insulating polyurethane layers. The sensor shows excellent sensitivity (15.46&#xa0;kPa<sup>−1</sup>), low limit of detection (less than 0.001&#xa0;N), a wide response range (0–300&#xa0;kPa), notable durability (over 9000 cycles), fast response time (less than 60&#xa0;ms) and, low cost (about 0.484 RMB). It can distinctly register a variety of human physiological signals, from hand motions to subtle activities, such as breathing, phonation, and wrist pulse. Placing one sensor on throat, phonation, blood pulse wave, and respiration wave can be simultaneously recorded and distinguished. The decoupling of different signals is accomplished through wavelet transform, which enables synchronous acquisition of multiple physiological signals while effectively reducing noise interference. The demonstrated strategy can be readily employed to construct other wearable sensors, and it has promising applications in electronic skins and wearable sensing devices for healthcare, robotic systems, and prosthetics.</p> Graphical abstract <p></p>

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A sensitive capacitive sensor fabricated by paper-based microfluidics for multi-parametric health monitoring

  • 期刊论文

  • 发表日期：

    2025年5月25日

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  • Renqiao Wang,
  • Liping Xie,
  • Yue Xu

摘要

The creation of wearable sensors that achieve high sensitivity, flexibility, cost-effectiveness, and ease of fabrication is highly desirable but presents considerable challenges. Here we propose a low-cost and simple fabrication strategy to achieve an ultrasensitive and flexible sensor by paper-based microfluidics. The capacitive sensor consists of silver nanowire electrodes separated by insulating polyurethane layers. The sensor shows excellent sensitivity (15.46 kPa−1), low limit of detection (less than 0.001 N), a wide response range (0–300 kPa), notable durability (over 9000 cycles), fast response time (less than 60 ms) and, low cost (about 0.484 RMB). It can distinctly register a variety of human physiological signals, from hand motions to subtle activities, such as breathing, phonation, and wrist pulse. Placing one sensor on throat, phonation, blood pulse wave, and respiration wave can be simultaneously recorded and distinguished. The decoupling of different signals is accomplished through wavelet transform, which enables synchronous acquisition of multiple physiological signals while effectively reducing noise interference. The demonstrated strategy can be readily employed to construct other wearable sensors, and it has promising applications in electronic skins and wearable sensing devices for healthcare, robotic systems, and prosthetics.

Graphical abstract