Fluorescent Gold Nanoclusters: Synthesis and Recent Biological Application

Figure 7

(a) and (c) are TEM of Au nanocrystals before and after ligand-induced etching. (b) UV-vis spectra of the original Au nanocrystals (black), the etched nanocrystals after separation (red), the AuNCs mixture after etching (green), and the purified AuNCs after separation (blue). (d) Color photographs of the original Au nanocrystals in chloroform (left) and the purified AuNCs in water (right). UV light (365 nm). Reprinted with permission from [64], ©(2007), American Chemical Society.

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