Facile synthesis of a novel fluorescent Au nanoclusters using sunset yellow as template and their application in multiple substances detection.

Abstract

Fluorescent (FL) Au nanoclusters (Au NCs) have excellent physicochemical properties and been widely used in analysis fields. In this study, a novel FL Au NCs with dual excitation wavelength and dual emission wavelength was prepared by a one-pot aqueous method. Sunset yellow (SY) was firstly used as ligand to fabricate Au NCs and the synthetic method is extremely facile. The FL performance of SY-Au NCs is sensitive to pH, oxidizing/reducing substances and Hg2+. The FL response mechanism is different and the details were discussed. The detection limits of SY-Au NCs for NaClO, ascorbic acid (AA) and Hg2+ are 200 μM, 0.5 μM and 50 nM, respectively. The spiked experiment in real samples reflects the potential of probe for preliminary Hg2+ screening in drinking water.

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