Figure 7 | Scientific Reports

Figure 7

From: Graphene Quantum Dot Solid Sheets: Strong blue-light-emitting & photocurrent-producing band-gap-opened nanostructures

Figure 7

X-Ray absorption spectroscopy measurements of GQDs and GQD solid sheet structures at C, N and O K-edges. (a) C K-edge spectra of GQDs and solid sheet samples (Z0-Z9), (b) enlarged C-K edge spectra showing the rise of excitonic peak at 286.3 eV with metal doping effect, (c) N K-edge showing the presence of graphitic nitrogen with a sharp peak at 401.1 eV, (d) O K-edge spectra showing the presence of C-O and C=O in our samples.

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