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Chapter 7 – Application of Graphene composites: Raman Strain Sensors 7.3.2.5.1. G band shift in model CVD graphene coatings Bissett et al. showed a G band upshift on tension in CVD graphene compared to a down shift in MC graphene.277 This behaviour was related to the presence of domain grain boundaries in the polycrystalline CVD graphene. This anomalous behaviour was not observed in the CVD graphene coatings in this study. Attempts were made to check if the behaviour was followed in the CVD graphene used in this study. Figure 7.17 show the shift of G band with strain after five deformation cycles (uniform maximum strain). It should be noted that, the G band of graphene is overlapped by the substrate peak at similar wavenumber. Since the substrate peak is unaffected by the applied strain, when the curve was fitted with one Lorentzian function the general behaviour (downshift on straining) of the G band on uniaxial tension was observed. A shift rate of ~ -14.72 cm-1/% strain was observed during loading. Relatively large error bars were related to the curve fitting variations. However, careful analysis of Bissett et al.’s experimental details show that their upshift was probably due to the fact that strain was not measured directly but rather inferred from the Raman peak shift, assuming the band shift per unit strain for a perfect crystal.277 Figure 7.17: Shift of G band with strain in model CVD graphene coatings 224PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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