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Chapter 5 – Production of Few Layer Graphene in Organic Solvents 5.3 and Figure 5.4 under ambient environment. By analysing the height changes in fold and incompletely exfoliated graphene, the step height was determined always as a multiple of ~0.5 nm. Figure 5.4: a, d, and i) AFM height scans showing monolayer graphene flakes in each image. The respective height profiles of monolayer graphene in (b, e, and j) have apparent height between 0.9-1.1 nm. Corresponding amplitude images in (c,f and k) was also used to measure the lateral dimensions. Samples were prepared from FLG/NMP (a and d) and FLG/DMF (i and j). Coleman et al. have also reported that the measured height of monolayer from such dispersions ranges from 1-2 nm (even up to 2.6 nm), which was characterised by its well-defined edges similar to TEM observations.54, 77 In this study, the thinnest flakes observed amongst all the analysed AFM images had a height between 0.9-1.1 nm (5-15 % 137PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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