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Chapter 7 β Application of Graphene composites: Raman Strain Sensors Figure 7.20: a) Cyclic deformation sequence II and the response of the 2D band position of commercial CVD graphene. b) The shift of 2D band vs. loading strain with respect to the deformation cycle. c) Shift rate of 2D band, obtained from slopes of (b). The dashed horizontal line indicates the theoretical ideal shift rate calculated by using the Gruneisen parameter (πΎ=2.7). d) Shift rates of different graphene composite coating with 0.5 % maximum strain. The commercial CVD graphene coating had relatively less residual compression when compared to the in-house grown graphene (~2660 cm-1 for in-house CVD and ~2654 cm-1 for commercial CVD). Unlike the in-house CVD graphene, the residual compression relaxed slightly in the initial cycle before the response stabilises in the subsequent deformation cycles as observed in Figure 7.20a, b. Some of the plausible reasons are; ο· Broad FWHM(2D) band and the πΌ2π·βπΌπΊ ~ 1.5, indicates that the graphene might be bilayer than monolayer and hence the upshift of the observed 2D band position. ο· It is reported previously that the exfoliated bilayer graphene with top and bottom polymer coat is almost similar in transferring stress to the polymer layers when compared to monolayer with top and bottom polymer coat.4, 274 However, the observed shift rate in this case (~ -14 cm-1/% strain) is at least 70 % and 60 % 227PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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