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. Author manuscript; available in PMC: 2013 Nov 6.
Published in final edited form as: Chem Commun (Camb). 2012 Feb 20;48(26):10.1039/c2cc17703j. doi: 10.1039/c2cc17703j

Figure 2.

Figure 2

Changes in the size and fluorescence of bare Pdots, PSS-coated Pdots, and PSS/PMANa-coated Pdots in three different solutions: PBS (pH 7.4), 1mM Cu(II) (CuSO4 in DI water), and 100 μM Fe(II) (FeSO4 in DI water). (a)–(c) The diameters of Pdots were monitored by DLS. Bare Pdots and Pdots formed by co-condensation with PSMA both increased in size, indicating the formation of aggregates in the three solutions; polyelectrolyte-coated Pdots showed excellent colloidal stability and no signs of aggregation. (d) The fluorescence intensities of bare Pdots and PSMA-blended Pdots also showed significant reduction in the three solutions, again indicating aggregation and self quenching; polyelectrolyte-coated Pdots showed excellent stability without a decrease in fluorescence emission. Control samples were dispersed in DI water.