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Chapter 7 – Application of Graphene composites: Raman Strain Sensors shown in Figure 7.1g. The presence of some species which are not graphene-like could also be observed in the magnified images (arrow marks in Figure 7.1h). Figure 7.2: SEM images of electrochemically exfoliated graphene. a, d) As produced FLG-5 and FLG-20 from electrochemical process. b, e) Magnified images showing the intercalated graphite flakes (arrow marks) as a result of electrochemical exfoliation. c, f) Images from FLG-5 and FLG-20 after 30 min sonication in acetone, respectively. Recently it has been shown that electrochemical exfoliation of graphite can produce large diameter FLG flakes.123 The diameter of the flakes is shown to be controlled by the graphite grain size in the initial electrode.123 FLG with two different sizes were produced by electrochemical exfoliation: 5 μm (FLG-5) and 5 μm (FLG-20). SEM images of as-supplied material of FLG-5 and FLG-20 is shown in Figure 7.2a and Figure 7.2b, respectively. Magnified images in Figure 7.2b,e show the intercalated graphite along with individual flakes. These samples were dispersed in acetone for 30 min by ultrasonication to homogenise them. Individual flakes can be observed in Figure 7.2c. Whereas for FLG- 20, the flakes were still aggregated (Figure 7.2f) and were relatively thick when compared to the other samples. These SEM images were used to analyse the flake size after the solution processing and is shown in Table 7-2. 7.2.2. Raman spectroscopy characterisation of FLG and FLG/epoxy composite coatings It is well-known that Raman spectroscopy can give information on the degree of exfoliation, nature of defects, and size of the flakes. So, Raman spectroscopy was 199PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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