Fig. 2. (a) Effect of time intervals of irradiation with a UV lamp on fluorescence intensity of PNCDs. (b) Effect of oxidant on the fluorescence intensity of PNCDs. (c) Effect of ionic strengths on the fluorescence intensity of PNCDs (ionic strengths were controlled by various concentrations of NaCl in aqueous solution). (d) Effects of storage time on the fluorescence intensity of the PNCDs.
