Fig. 2. (a) Electrical resistance of RGOEY-1, RGOEY-2, FRGOEY-1, and FRGOEY-2 as a function of number of RGO coatings. The average resistance values of the samples were calculated for ten specimens for each sample and the error bars denote the standard deviation. (b) Relative variations in resistance of four samples up to 400% strain in the first stretch-release cycle. (c) Resistance vs. strain for RGOEY-1 (black square), RGOEY-2 (red circle), FRGOEY-1 (pink triangle), and FRGOEY-2 (dark yellow triangle). (d) Relative variations in resistance over 5000 repeated stretch-release cycles at 400% strain.