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Transmission Electron Microscope (TEM) images of the materials: (A) SWCNH, (B) SWCNH-ox-0.5, (C) SWCNH-ox-1, (D) SWCNH-ox-1.5, and (E) SWCNH-ox-3. Circles show the tip shapes and an amorphous carbon evaluation through the oxidation process. (F) Dependence of ID3/IG on the oxidation time.
