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Chapter 7 – Application of Graphene composites: Raman Strain Sensors employed to characterise the nature of as-produced/as-received FLG and the FLG/epoxy composites. Figure 7.3: a) Raman spectra of solution processed FLG. A spectrum of graphite is shown for comparison. b) Raman spectra of 5 wt% FLG/epoxy composite coatings. The highlighted regions show the epoxy region of the spectra. The Raman spectra of the starting FLGs (after solution processed in acetone for 30 min) is shown in Figure 7.3a. The first observation is that all the spectra are different to that of graphite, indicating successful exfoliation.48 FLG-0.2 has a symmetrical 2D band, similar to the observations in 5.2.3.1, suggesting turbostratic graphene. The presence of an intense D band is mainly due to the edges of the flakes and not of in-plane defects. For FLG-0.5, the shape of the 2D band suggests few-layer nature (< 6 layers)48 and the D band is due to the edges.3 It has been shown in 5.2.3.2 that the sonication does not produce any new basal-plane defects and the increase in the D band is due to the edges of graphene. For FLG-1 (Elicarb® Graphene powder), as shown in the manufacturer’s product information, the 2D band shows few-layer nature with average of 5-7 atomic layers and the D band is associated with the edges.337 The shape of the 2D band for 200PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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