A Highly Aligned Nanowire-Based Strain Sensor for Ultrasensitive Monitoring of Subtle Human Motion
- 1 June 2020
- Vol. 16 (24), e2001363
- https://doi.org/10.1002/smll.202001363
Abstract
Achieving highly accurate responses to external stimuli during human motion is a considerable challenge for wearable devices. The present study leverages the intrinsically high surface-to-volume ratio as well as the mechanical robustness of nanostructures for obtaining highly-sensitive detection of motion. To do so, highly-aligned nanowires covering a large area were prepared by capillarity-based mechanism. The nanowires exhibit a strain sensor with excellent gauge factor (approximate to 35.8), capable of high responses to various subtle external stimuli (<= 200 mu m deformation). The wearable strain sensor exhibits also a rapid response rate (approximate to 230 ms), mechanical stability (1000 cycles) and reproducibility, low hysteresis (<8.1%), and low power consumption (<35 mu W). Moreover, it achieves a gauge factor almost five times that of microwire-based sensors. The nanowire-based strain sensor can be used to monitor and discriminate subtle movements of fingers, wrist, and throat swallowing accurately, enabling such movements to be integrated further into a miniaturized analyzer to create a wearable motion monitoring system for mobile healthcare.Keywords
Funding Information
- Bill and Melinda Gates Foundation (OPP1109493)
- Horizon 2020
- China Postdoctoral Science Foundation (2019TQ0242, 2019M660061XB)
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