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Research Article

Multi-attribute wearable pressure sensor based on multilayered modulation with high constant sensitivity over a wide range

Ning Li1,2,§, Song Gao1,2,§, Yang Li1,2( ), Jianwen Liu1,2, Wenhao Song4, Guozhen Shen3( )
School of Information Science and Engineering, University of Jinan, Jinan 250022, China
Shandong Provincial Key Laboratory of Network Based Intelligent Computing, University of Jinan, Jinan 250022, China
School of Integrated Circuits and Electronics, Beijing Institute of Technology, Beijing 100081, China
School of Aeronautical and Astronautical Engineering Purdue University, West Lafayette, IN 47907, USA

§ Ning Li and Song Gao contributed equally to this work.

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Graphical Abstract

A breathable, biocompatible, and biodegradable wearable piezoresistive pressure sensor based on multilayered modulation with high constant sensitivity over a wide range is proposed and reported, enabling the high-sensitivity detection of monitoring versatile human vital physiological signals. In light of the superior sensing performance, an integrated sensor array system that can locate objects’ positions is constructed and applied to simulate sitting posture monitoring.

Abstract

Flexible pressure sensors capable of monitoring diverse physiological signals and body movements have garnered tremendous attention in wearable electronic devices. Thereinto, high constant sensitivity over a wide pressure range combined with breathability, biocompatibility, and biodegradability is pivotal for manufacturing of reliable pressure sensors in practical sensing applications. In this work, inspired by the multilayered structure of skin epidermis, we propose and demonstrate a multi-attribute wearable piezoresistive pressure sensor consisting of multilayered gradient conductive poly(ε-caprolactone) nanofiber membranes composites. In response to externally applied pressure, a layer-by-layer current path is activated inside the multilayered membranes composites, leading to the most salient sensing performance of high constant sensitivity of 33.955 kPa−1 within the pressure range of 0–80 kPa. The proposed pressure sensor also exhibits a fast response–relaxation time, a low detection limit, and excellent stability, which can be successfully used to measure human physiological signals. Lastly, an integrated sensor array system that can locate objects’ positions is constructed and applied to simulate sitting posture monitoring. These results indicate that the proposed pressure sensor holds great potential in health monitoring and wearable electronic devices.

Keywords

wearable pressure sensorsmultilayer structurehigh constant sensitivitymulti-attributephysiological signals monitoring

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Nano Research
Volume 16 Issue 5,
May 2023
Pages 7583-7592
DOI: 10.1007/s12274-022-5371-6
Cite this article:
Li N, Gao S, Li Y, et al. Multi-attribute wearable pressure sensor based on multilayered modulation with high constant sensitivity over a wide range. Nano Research, 2023, 16(5): 7583-7592. https://doi.org/10.1007/s12274-022-5371-6
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Pressure sensors

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Received: 03 September 2022
Revised: 27 November 2022
Accepted: 02 December 2022
Published: 16 February 2023
© Tsinghua University Press 2022
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