A Highly Aligned Nanowire‐Based Strain Sensor for Ultrasensitive Monitoring of Subtle Human Motion
- 10 May 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 (≈35.8), capable of high responses to various subtle external stimuli (≤200 µm deformation). The wearable strain sensor exhibits also a rapid response rate (≈230 ms), mechanical stability (1000 cycles) and reproducibility, low hysteresis (<8.1%), and low power consumption (<35 µW). 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)
This publication has 48 references indexed in Scilit:
- Printing Nanostructures with a Propelled Anti‐Pinning Ink DropletAdvanced Functional Materials, 2015
- Tunable Piezoresistivity of Nanographene Films for Strain SensingACS Nano, 2015
- Capillary force lithography: the versatility of this facile approach in developing nanoscale applicationsNanoscale, 2014
- Highly Stretchable and Sensitive Strain Sensor Based on Silver Nanowire–Elastomer NanocompositeACS Nano, 2014
- Flexible Sensors Based on NanoparticlesACS Nano, 2013
- PEDOT Nanocrystal in Highly Conductive PEDOT:PSS Polymer FilmsMacromolecules, 2012
- Human skeleton tracking from depth data using geodesic distances and optical flowImage and Vision Computing, 2012
- Monolayered Wires of Gold Colloidal Nanoparticles for High-Sensitivity Strain SensingThe Journal of Physical Chemistry C, 2011
- Nanowire active-matrix circuitry for low-voltage macroscale artificial skinNature Materials, 2010
- Theoretical and Experimental Studies of Bending of Inorganic Electronic Materials on Plastic SubstratesAdvanced Functional Materials, 2008