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(a) TEM images of the nanocrystals obtained from waste coal (inset: SAED pattern of the nanocrystal which depicts the polycrystalline nature of the obtained ND sample), (b) size distribution image of the carbon nanocrystals, and (c) HR-TEM image of a large size carbon nanocrystal of sizes between 4 and 10 nm. Below are the energy-dispersive spectroscopy images of carbon nanocrystals which mainly consist of carbon, oxygen, and nitrogen.
