Nanographene was synthesized from platelet carbon nanofiber by supercritical fluid (SCF) exfoliation without acid oxidation. During the exfoliation process, a progressive decrease in the number of layers was accompanied by the cutting of the basal plane. Raman spectroscopy was used to identify the quality of the samples, revealing that the defect density in the basal plane of the nanographene can be reduced to less than that of the starting material during SCF exfoliation.
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