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Issue 19, 2017
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On-skin liquid metal inertial sensor

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A wireless on-skin inertial sensor based on free-moving liquid metal is introduced. The inertial sensor comprises a eutectic gallium–indium (eGaIn) droplet that modulates the capacitance between two electrodes. The capacitive output of the sensor is connected to a planar coil to form an LC resonator whose resonant frequency can be read out wirelessly. Liquid metal electrodes and the coil are fabricated on a 20 μm thick silicone membrane, which can stretch up to 600%, using spray-deposition of eGaIn. The moving droplet is encapsulated on the opposite side of the membrane using spray-deposition of Dragon Skin 10 silicone. The output characteristics, electrical simulations of the capacitance, and dynamic characteristics of the sensor are shown. The sensor is used for measuring tilt angles and recording arm gestures.

Graphical abstract: On-skin liquid metal inertial sensor

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The article was received on 14 Jul 2017, accepted on 14 Aug 2017 and first published on 24 Aug 2017

Article type: Paper
DOI: 10.1039/C7LC00735C
Citation: Lab Chip, 2017,17, 3272-3278
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    On-skin liquid metal inertial sensor

    M. Varga, C. Ladd, S. Ma, J. Holbery and G. Tröster, Lab Chip, 2017, 17, 3272
    DOI: 10.1039/C7LC00735C

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