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Graphene oxide quantum dots (GOQDs) were synthesized by liquid-phase oxidation using the mixture of HNO3 and H2SO4. These GOQDs showed blue-green photoluminescence (PL), and a dual-wavelength emission. The emission peak could be distinguished as two peaks located at 463 nm and 496 nm. The GOQDs were further step-wise reduced using different amount of hydrazine to obtain reduced quantum dots (RQDs)...
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