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A. Adetayo, D. Runsewe their counterparts in the topographic AFM images. However, they could be dis- tinguished by their phase contrast with the unreduced graphene oxide showing a phase difference on the HOPG substrate while the RGO showed little phase con- trast with the HOPG substrate (due to little defects). The thickness of the chem- ically reduced graphene oxide nanosheet was reported as ~1 nm using tapping mode AFM as shown in Figure 8. It was concluded that the chemically reduced graphene oxide still contained some oxygen functional groups [29]. Figure 6. Schematic illustration of graphene oxide synthesis by chemical oxidation using Brodie’s [5], Staudenmaier’s [53], and Hummer’s methods [54]. Figure 7. Synthesis route of graphene from graphite [72]. Figure 8. Tapping mode atomic force micrographs: (a) Phase image of unreduced graphene oxide nanosheet; (b) Phase image of chemically reduced graphene oxide nanosheet; (c) Height of chemically reduced graphene oxide nanosheet [29]. DOI: 10.4236/ojcm.2019.92012 214 Open Journal of Composite MaterialsPDF Image | Synthesis and Fabrication of Graphene and Graphene Oxide
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