4.7 Article

Flexible piezoresistive pressure sensor based on wrinkled layers with fast response for wearable applications

Journal

MEASUREMENT
Volume 201, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2022.111645

Keywords

Flexible pressure sensor; Wrinkled morphology; Piezoresistive sensor; Silver nanowire; Human motion monitoring; Micro-structure

Funding

  1. National Natural Science Foundation of China [52175525]
  2. Science and Technology Project of Henan Province [222102230032]

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In this study, a flexible piezoresistive pressure sensor based on silver nanowires and polydimethylsiloxane was developed, which exhibited high sensitivity and a large pressure range. It has great potential in human-machine interaction, human motion monitoring, and intelligent robotic systems.
Flexible piezoresistive sensors are promising candidates for vital components of prospective wearable sensing systems in human-centered intelligent applications. Herein, we present a novel flexible piezoresistive pressure sensor based on the structure of silver nanowires (AgNWs) on polydimethylsiloxane (PDMS) with a wrinkled surface. Modifying the PDMS microstructure enables the sensor to obtain different sensitivities and pressure ranges. At the optimal conditions, our sensor exhibits a high sensitivity of 2.588 kPa(-1) and a large pressure range with a very low detectable pressure limit (<1 Pa), which can measure a seed weight of sesame (similar to 2 mg). Furthermore, The elastic microstructure-based piezoresistive sensor also possesses a very fast response time (10 ms), rapid recovery (20 ms), and excellent cycling stability. The real-time pressure detection ability is demonstrated by the touching behavior, the muscle and joint movement and the vocalization recognition, presenting great application potential in human-machine interaction, human motion monitoring and intelligent robotic systems.

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