Figure 2
From: Large Scale Synthesis and Light Emitting Fibers of Tailor-Made Graphene Quantum Dots
(a) Schematic drawing illustrating the solution-phase etching of GO sheets to prepare GQDs. An aqueous GO dispersion (0.2 wt. %) was mixed with NH4OH and H2O2 in a sealed vessel and was directly heated at 150 °C for 5 h. After allowing the resulting solution to naturally cool, it was filtered. (b) Photographs of the GQDs dispersions, prepared at 150, 200 and 300 °C from left to right, under 365 nm UV light. (c) Comparison of the PL spectra of the GQDs. (d) CIE color coordinates (1931) derived from the emission spectra presented in (c). (e) Variation of relative quantum yields of GQDs vs. time for 12 months.
