Figure 7From: Controllable size-selective method to prepare graphene quantum dots from graphene oxide UV absorption, PL spectrum, and PL property of GQDs-1 and GQDs-2. (a) UV/Vis absorption of the GQDs-1 and GQDs-2 were dispersed in water; (b) PL spectra of the GQDs-1 at different excitation wavelengths from 340 to 440 nm. (c) PL spectra of the GQDs-2 at different excitation wavelengths from 340 to 540 nm in water solution.Back to article page