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. Author manuscript; available in PMC: 2009 Aug 31.
Published in final edited form as: Annu Rev Phys Chem. 2007;58:409–431. doi: 10.1146/annurev.physchem.58.032806.104546

Figure 7.

Figure 7

Emission spectra (excitation at 375 nm) of aqueous PAMAM dendrimer (a) encapsulating NaBH4-reduced gold nanoclusters and (b) treated with persulfate with increasing additions of Na2S (red curve to violet curve). Insets (c) and (d) show spectra (a) and (b), respectively, normalized to equal integrated intensity. The persulfate-treated samples show the creation of a green-emitting species apparent at as little as a 20-fold excess of Na2S, while all but the two final Au-containing samples (500- and 1000-fold excess of Na2S) show no change in peak shape.