Figure 1.

a Schematic representation of Hg2+ sensing based on the fluorescence quenching of BSA-GNPs. b Fluorescence spectra of BSA-GNPs in the (a) absence and (b) presence of Hg2+ (4.0 μM), the inset shows corresponding photograph under (top) visible and (bottom) UV light

Chai et al. Nanoscale Research Letters 2010 5:1856-1860   doi:10.1007/s11671-010-9730-y