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Issue 17, 2016
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Wearable tactile sensor based on flexible microfluidics

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Abstract

In this work, we develop a liquid-based thin film microfluidic tactile sensor of high flexibility, robustness and sensitivity. The microfluidic elastomeric structure comprises a pressure sensitive region and parallel arcs that interface with screen-printed electrodes. The microfluidic sensor is functionalized with a highly conductive metallic liquid, eutectic gallium indium (eGaIn). Microdeformation on the pressure sensor results in fluid displacement which corresponds to a change in electrical resistance. By emulating parallel electrical circuitry in our microchannel design, we reduced the overall electrical resistance of the sensor, therefore enhancing its device sensitivity. Correspondingly, we report a device workable within a range of 4 to 100 kPa and sensitivity of up to 0.05 kPa−1. We further demonstrate its robustness in withstanding >2500 repeated loading and unloading cycles. Finally, as a proof of concept, we demonstrate that the sensors may be multiplexed to detect forces at multiple regions of the hand. In particular, our sensors registered unique electronic signatures in object grasping, which could provide better assessment of finger dexterity.

Graphical abstract: Wearable tactile sensor based on flexible microfluidics

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Supplementary files

Article information


Submitted
30 Apr 2016
Accepted
07 Jul 2016
First published
07 Jul 2016

This article is Open Access

Lab Chip, 2016,16, 3244-3250
Article type
Paper

Wearable tactile sensor based on flexible microfluidics

J. C. Yeo, J. Yu, Z. M. Koh, Z. Wang and C. T. Lim, Lab Chip, 2016, 16, 3244
DOI: 10.1039/C6LC00579A

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