Printable G-putty for Frequency and Rate Independent, High Performance Strain Sensors
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2021Access:
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Daniel P. O Driscoll, Sean McMahon, James Garcia, Sonia Biccai, Cian Gabbett, Adam G. Kelly, Sebastian Barwich, Matthias Moebius, Conor S. Boland and Jonathan N. Coleman, Printable G-putty for Frequency and Rate Independent, High Performance Strain Sensors, 2021Abstract:
While nanocomposite electromechanical sensors are expected to display reasonable conductivity and high sensitivity, little consideration is given to eliminating hysteresis and strain rate/frequency dependence from their response. For example, while G-putty, a composite of graphene and polysiloxane, has very high electromechanical sensitivity, its extreme viscoelasticity renders it completely unsuitable for real sensors due to hysteretic and rate-/frequency-dependent effects. Here it is shown that G-putty can be converted to an ink and printed into patterned thin films on elastic substrates. A partial graphene-polymer phase segregation during printing increases the thin-film conductivity by ×106 compared to bulk, while the mechanical effects of the substrate largely suppress hysteresis and completely remove strain rate and frequency dependence. This allows the fabrication of practical, high-gauge-factor, wearable sensors for pulse measurements as well as patterned sensors for low-signal vibration sensing.
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http://people.tcd.ie/colemajhttp://people.tcd.ie/mobiusm
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Author: Coleman, Jonathan; Moebius, Matthias
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Percolation, Piezoresistance, Pressure sensingDOI:
https://doi.org/10.1002/smll.202006542Metadata
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