Abstract
We have synthesized fluorescent and stable silver nanoclusters (AgNCs) capped with poly (methacrylic acid), PMAA, by UV irradiation process. The NCs are well dispersed in aqueous solution and present a uniform distribution with an average dimension of 1.45 ± 0.26 nm. The fluorescence excited at 340 nm was found to be sensitive to the presence of heavy metal ions in solution. In particular, a peculiar fluorescence enhancement was detected upon interaction with lead(II) ions. A linear behavior of the fluorescence intensity as a function of the Pb2+ concentration was measured and a detection limit of 60 nM was estimated. A possible mechanism of the interaction between AgNCs and metal ions is discussed.
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