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(A) Single-layer GO sheet from GrO exfoliated by liquid-phase sonication; the morphology is flat without visible damage. (B) Thermally microwave-exfoliated rGO, showing roughness. (C) Wrinkled GO-COOH sheet, presenting with very clear damage and holes in both edges and the basal plane. (D) Wrinkled GO-COOH sheet with a flat zone, which indicates a single-layer according to its EDP (insert).
