Fig. 2
From: Graphene electronic fibres with touch-sensing and light-emitting functionalities for smart textiles
Touch sensors: a Photographs of sensors with single layer graphene (SLG), few-layer graphene (FLG) fabricated using the roll-to-roll (R2R), solution processed graphene films obtained by liquid-exfoliation blade cut (LEG) and using the R2R compatible method. The LEG sensors using the standard patterning is also shown. b Sketch of the impedance response with and without touching. c Impedance upon touching versus time for flat FLG device. d Impedance upon touching versus time with repeated touching for FLG device. e Impedance upon touching versus time with repeated bending for FLG device. f Difference in performance between touch sensors patterned using the R2R compatible method and sensors patterned using reactive ion etching (RIE) for LEG. g Photo and schematics of position sensitive arrays. h Voltage drop upon touching vs. time for position sensitive arrays. i Time-resolved rise and fall times upon touching for position sensitive arrays. The various on/off intervals in c, d, e, f, h are due to the difference in the intensity and duration of the user’s finger touching the device
