4.6 Article

Wearable Capacitive Pressure Sensor for Contact and Non-Contact Sensing and Pulse Waveform Monitoring

期刊

MOLECULES
卷 27, 期 20, 页码 -

出版社

MDPI
DOI: 10.3390/molecules27206872

关键词

capacitive sensor; porous PDMS; MWCNT; wearable pressure sensor; heart rate monitor; proximity sensing

资金

  1. National Science Foundation (NSF) Engineering Research Center for Precise Advanced Technologies and Health Systems for Underserved Populations (PATHSUP ERC) [1648451]

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This paper reports a low-cost and high-sensitivity pressure sensor method using a porous PDMS polymer and MWCNT composite dielectric layer. The sensor exhibits high sensitivity and low limit of detection, and demonstrates excellent stability under cyclic loading. The sensor is suitable for various applications such as tactile sensing and non-contact sensing.
Sensitive and flexible pressure sensors have invoked considerable interest for a broad range of applications in tactile sensing, physiological sensing, and flexible electronics. The barrier between high sensitivity and low fabrication cost needs to be addressed to commercialize such flexible pressure sensors. A low-cost sacrificial template-assisted method for the capacitive sensor has been reported herein, utilizing a porous Polydimethylsiloxane (PDMS) polymer and a multiwalled carbon nanotube (MWCNT) composite-based dielectric layer. The sensor shows high sensitivity of 2.42 kPa(-1) along with a low limit of detection of 1.46 Pa. The high sensitivity originates from adding MWCNT to PDMS, increasing the composite polymer's dielectric constant. Besides this, the pressure sensor shows excellent stability at a cyclic loading of 9000 cycles, proving its reliability for long-lasting application in tactile and physiological sensing. The high sensitivity of the sensor is suitable for the detection of small deformations such as pulse waveforms as well as tactile pressure sensing. In addition, the paper demonstrates a simultaneous contact and non-contact sensing capability suitable for dual sensing (pressure and proximity) with a single data readout system. The dual-mode sensing capability may open opportunities for realizing compact systems in robotics, gesture control, contactless applications, and many more. The practicality of the sensor was shown in applications such as tactile sensing, Morse code generator, proximity sensing, and pulse wave sensing.

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