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. 2014 Jun 18;4:5294. doi: 10.1038/srep05294

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(A) Representative TEM images of GQDs- NaOH. Inset panels show the HR-TEM image (left) and size (diameter) distribution (right). (B) SPM height image of the graphene nanoparticles. Line through some of the GQDs-NaOH shows the height profile. (C) UV-Vis spectrum (dash curve) and photoluminescence spectra (solid curves) of the graphene nanoparticles. (D) X-ray photoelectron spectroscopy (XPS) full scan survey and the high-resolution C1s spectra are shown in inset.