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Chapter 7 β Application of Graphene composites: Raman Strain Sensors Similar observations were reported by Valles et al. for PMMA/GO nanocomposites.294 Reasoning this, only 5 wt.% epoxy/FLG composite coatings were prepared for this study. As can be seen in Figure 7.3b, the solution processed 5 wt.% FLG/epoxy composite coatings show relatively good intensity of 2D band when compared to epoxy. The shapes of the 2D band of graphene in the composite samples were almost similar to the starting material suggesting the exfoliated nature is retained within the sample. It can also be noted a slight increase in the πΌπ·βπΌπΊ ratio of the FLG-5 and FLG-20/epoxy composite ((πΌπ· βπΌπΊ )ππππ ) coatings. This increase in (πΌπ· βπΌπΊ )ππππ ratio (Table 7-1) suggests that, during the solution processing of these composites, the sonication does reduce the size of the flakes. Figure 7.4: a) Schematic representation of MC Graphene composite coating. b) Schematic representation of the 4-point bending. c) Raman spectra of a MC SLG. The spectrum of the substrate is also shown for comparison. The absence of D band indicates the high quality of graphene. In order to evaluate the strain response of FLG/epoxy composite, a reference composite coating with MC SLG was prepared as described in section 4.2.2. Figure 7.4a shows the schematic of the reference SLG composite coating. Raman spectra of the SLG composite coating shows an intense 2D band with πΌ2π·βπΌπΊ > 3. The absence of a D band in the composite indicates high crystalline order of the graphene. 202PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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