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Chapter 7 – Application of Graphene composites: Raman Strain Sensors damaged interface and hence the reduced shift rates (~ -40 cm-1/% strain, effective modulus of ~ 0.67 ± 0.01 TPa). The position of 2D band at 0 % strain at the 1st cycle (~ 2626 cm-1) is similar to the 2D band position at 0.5 % strain of the 5th and 6th deformation cycle (highlighted regions of Figure 7.16b) indicating that the graphene flake was under a pre-tension in order of ~0.5 % strain which is in agreement with the recent report on the presence of residual strain in the exfoliated graphene.448 Unlike the MC flakes studied for sequence I and II, this graphene flake was under residual pre-tension (from fabrication step). Upon cyclic deformation, similar to CVD graphene, the residual stresses relaxed in the initial few deformation cycles and elastic deformation was observed in the subsequent deformation cycles. The interesting result was that, no strain hardening effect was observed here unlike the previously studied exfoliated graphene flakes in sequence I and II, suggesting that presence of residual strains and the initial conditioning steps (few cyclic deformation cycles) are in fact a benefit from the strain sensing point of view, thereby eliminating any unreliability during strain measurements. 221PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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