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Keywords:

  • graphite nanoparticels;
  • graphene quantum dot;
  • graphene oxide quantum dot;
  • monolayer;
  • photoluminescence
Thumbnail image of graphical abstract

Pristine graphene quantum dots and graphene oxide quantum dots are synthesized by chemical exfoliation from the graphite nanoparticles with high uniformity in terms of shape (circle), size (less than 4 nm), and thickness (monolayer). The origin of the blue and green photoluminescence of GQDs and GOQDs is attributed to intrinsic and extrinsic energy states, respectively.