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Chapter 5 β Production of Few Layer Graphene in Organic Solvents πΏπ ππππ and πΏπ΄πΉπ match each other. Hence this method could be used to estimate of mean lateral size of graphene flakes with a relative error of ~17 %. Figure 5.14: Plot between the calculated πΏπ ππππ and the measured πΏπ΄πΉπ vs sonication time. Recently Eckmann et al. studied the nature of defects in graphene by probing the πΌπ·βπΌπ·β² ratio. This ratio depends on the nature of the defects, πΌπ·βπΌπ·β² ~ 3.5 for boundary or edge type defects, πΌπ· βπΌπ·β² ~ 7 for vacancy defects (basal plane defects) and πΌπ·βπΌπ·β² ~ 13 for sp3 type defects.57 Again, this ratio could be analysed for the samples to confirm the type of defects. Figure 5.15: a) πΌπ·βπΌπΊ ratio vs πΌπ·β²βπΌπΊ ratio for all FLG/NMP and FLG/DMF samples. The data point from starting graphite powder is added for reference. b) πΌπ·βπΌπ·β² ratio as a function of sonication time and centrifugation speed. The superimposed lines in (a) and (b) represent the type of defects from literature.57 151PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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