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Nano Lett. 2012 Apr 11;12(4):1821-5. doi: 10.1021/nl204052z. Epub 2012 Mar 21.

A highly elastic, capacitive strain gauge based on percolating nanotube networks.

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Department of Bioengineering, University of California, Berkeley, California 94720, USA.


We present a highly elastic strain gauge based on capacitive sensing of parallel, carbon nanotube-based percolation electrodes separated by a dielectric elastomer. The fabrication, relying on vacuum filtration of single-walled carbon nanotubes and hydrophobic patterning of silicone, is both rapid and inexpensive. We demonstrate reliable, linear performance over thousands of cycles at up to 100% strain with less than 3% variability and the highest reported gauge factor for a device of this class (0.99). We further demonstrate use of this sensor in a robotics context to transduce joint angles.

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