Printable G-putty for Frequency and Rate Independent, High Performance Strain Sensors
Item Type:Journal Article
Citation:O'Driscoll DP, McMahon S, Garcia J, Biccai S, Gabbett C, Kelly AG, Barwich S, Moebius M, Boland CS, Coleman JN., Printable G-Putty for Frequency- and Rate-Independent, High-Performance Strain Sensors, Small, 2021 Apr 15:e2006542
Printable G-putty for Frequency and Rate Independent, High Performance Strain Sensors.pdf (Accepted for publication (author's copy) - Peer Reviewed) 862.5Kb
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.
Author: Coleman, Jonathan
Type of material:Journal Article
Availability:Full text available