A Soft Strain Sensor Based on Ionic and Metal Liquids

Jean-Baptiste Chossat, Yong-Lae Park, Robert J. Wood, and Vincent Duchaine
IEEE Sensors Journal, Vol. 13, No. 9, October, 2013, pp. 3405-3414.


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Abstract
A novel soft strain sensor capable of withstanding strains of up to 100% is described. The sensor is made of a hyperelastic silicone elastomer that contains embedded microchannels filled with conductive liquids. This is an effort of improving the previously reported soft sensors that uses a single liquid conductor. The proposed sensor employs a hybrid approach involving two liquid conductors: an ionic solution and an eutectic gallium-indium alloy. This hybrid method reduces the sensitivity to noise that may be caused by variations in electrical resistance of the wire interface and undesired stress applied to signal routing areas. The bridge between these two liquids is made conductive by doping the elastomer locally with nickel nanoparticles. The design, fabrication, and characterization of the sensor are presented.

Keywords
wearable sensors, microfluidics, strain measurement, ionic solution, eutectic gallium indium (eGaIn).

Notes
Number of pages: 10

Text Reference
Jean-Baptiste Chossat, Yong-Lae Park, Robert J. Wood, and Vincent Duchaine, "A Soft Strain Sensor Based on Ionic and Metal Liquids," IEEE Sensors Journal, Vol. 13, No. 9, October, 2013, pp. 3405-3414.

BibTeX Reference
@article{Park_2013_7477,
   author = "Jean-Baptiste Chossat and Yong-Lae Park and Robert J. Wood and Vincent Duchaine",
   title = "A Soft Strain Sensor Based on Ionic and Metal Liquids",
   journal = "IEEE Sensors Journal",
   pages = "3405-3414",
   month = "October",
   year = "2013",
   volume = "13",
   number = "9",
}