Abstract
In our work, a simple, facile, and green method was developed for the synthesis of water-soluble and well-dispersed fluorescent gold nanoparticles (Au NPs) within 5min, using captopril as a capping agent. The as-prepared Au NPs showed strong emission at 414nm, with a quantum yield of 5.5%. The fluorescence of the Au NPs can be strongly quenched by mercury (II) ion (Hg2+) due to the stronger interactions between thiolates (RS−) and Hg2+. It was applied to the detection of Hg2+ in water samples in the linear ranges of 0.033–0.133μM and 0.167–2.500μM, with a detection limit of 0.017μM. Therefore, the as-prepared Au NPs can meet the requirement for monitoring Hg2+ in environmental samples.
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