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Gallium‐Based Thin Films for Wearable Human Motion Sensors

  • Authors: Dejace, Laurent Mirko; Laubeuf, Nathan; Furfaro, Ivan; Lacour, Stéphanie
Authors: Dejace, Laurent Mirko; Laubeuf, Nathan; Furfaro, Ivan; Lacour, Stéphanie

Wearable electronic circuits based on the films of gallium and its alloys offer promising implementations in health monitoring and gaming sensing applications. However, the complex rheology of liquid metals makes it challenging to manufacture thin gallium‐based devices with reliable, reproducible, and stable properties over time. Herein, the surface coating and topography of silicone substrates are engineered to enable precisely defined, micrometer‐thick liquid metal patterns over large (>10 cm2) surface areas, and high design versatility. Control over the film microstructure meets manufacturing conditions that enable gallium films with a precise, repeatable, and durable electromechanical performance. The robustness and applicability of this technology in a virtual‐reality scenario is demonstrated by implementing thin, soft, and stretchable gallium‐based sensors to accurately monitor human hand kinematics.

Reference

Posted on: September 19, 2019

HYPER-FLEXIBLE 1-D SHAPE SENSOR

  • Authors: Dobrzynski, Michal; Vanderparre, Hugues; Pericet Camara, Ramon; L"Eplattenier, Géraud; Lacour, Stéphanie; Floreano, Dario

Here we describe a sensor capable of perceiving complex one-dimensional (1-D) shape of an underlying substrate in a static and dynamic manner. The sensor consists of seven, serially connected, hyper-flexible strain gauges, manufactured using stretchable-gold-conductordeposited-on-PDMS technology. The custom designed read-out scheme allows decoupling strain-sensitive resistances of the strain-gauges from the parasitic pressure- and temperature-sensitive resistances of the connectors. The developed prototype device confirms full operation within the tested deflections ranging from 0 o to 35 o, showing an average sensitivity of 36 !/o and an average resolution of 0.22 o. The read-out frequency of 100 Hz allows quick scanning of the whole sensor array.

Posted on: February 20, 2013