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Chapter 7 – Application of Graphene composites: Raman Strain Sensors micron range. Coleman et al. have shown that controlled centrifugation could be used to produce flakes with different lateral dimensions.62 This process has been adapted as described in section 4.1.2.3.2 to produce flakes with ~0.2 μm (FLG-0.2) and ~0.5 μm (FLG- 0.5) diameters. Commercially available Elicarb® Graphene powder with average size of ~1 μm was also used (FLG-1).337 Figure 7.1: SEM images of sonication-based exfoliated graphene. a, d) Starting graphite used to produce FLG-0.2 (b and c) and FLG-0.5 (e and f). g) As-supplied Elicarb® graphene powder from Thomas Swan Ltd. h) Magnified image from (g) with the arrow showing non graphene-like features (bright white). c, f and i) Images of FLG-0.2, FLG-0.5 and FLG-1 after 30 min sonication in acetone, respectively. Figure 7.1 shows the SEM images of FLG-0.2, FLG-0.5 and FLG-1 produced from sonication-based process. As seen clearly, the sizes of flakes have dramatically reduced from starting graphite (~200 μm) to produce graphene flakes with sub-micron diameter. Figure 7.1b,c,e,f are SEM images from drop casting of dispersions in acetone on SiO2/Si substrate, showing aggregation of flakes as a result of drying. Despite the aggregation, individual flakes can be observed with defined edges. These images were used to analyse the average flake sizes obtained. SEM image of as-received Elicarb® Graphene powder is 198PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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