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. 2016 Dec 16;6:39163. doi: 10.1038/srep39163

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(a) TEM image of GQDs. The inset shows the size distribution of the GQDs. (b) HRTEM image of an individual GQD. (c) Excitation-dependent PL spectra of the GQDs. (d) Emission-dependent PLE spectra of the GQDs.