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Transmission electron micrographs of the three graphene-acid derivatives (A) GA1, (B) GA2, and (C) GA3. The insets show higher-resolution images of the samples. (D) Scanning TEM-high-angle annular dark-field (HAADF) image and energy-dispersive X-ray spectroscopy (EDS) elemental mappings for (E) carbon and (F) oxygen in GA1; (G) combined carbon–oxygen map.
