Nanoclusters prepared from a silver/gold alloy as a fluorescent probe for selective and sensitive determination of lead(II) View Full Text


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Article Info

DATE

2015-02

AUTHORS

Chuanxi Wang, Hao Cheng, Yuanqing Sun, Zhenzhu Xu, Huihui Lin, Quan Lin, Chi Zhang

ABSTRACT

We report on the preparation of water-soluble and fluorescent silver/gold alloy nanoclusters (Ag/Au NCs) by a galvanic replacement reaction. The alloy NCs have an average diameter of 1.5 nm and are shown to be viable fluorescent probes for the determination of lead(II) due to aggregation-induced quenching of fluorescence. The alloy NCs are characterized in terms of photoluminescence spectrum, photoluminescence excitation spectrum, transmission electron microscopy and X-ray photoelectron spectroscopy which confirm the presence of alloy NCs. Bovine serum albumin, a well known stabilizing agent, has a high-affinity site for Pb2+ ion, and the resulting complex acts as a quencher of fluorescence. This finding has led to a method for selective determination of Pb2+ with a limit of detection of about 2 nM. Graphical AbstractA practical and robust synthesis of water-soluble and fluorescence active, small-size Ag/Au alloy nanoclusters are successfully developed through galvanic replacement reaction. As-prepared alloy nanoclusters indicate excellent selectivity and sensitivity for Pb2+. A practical and robust synthesis of water-soluble and fluorescence active, small-size Ag/Au alloy nanoclusters are successfully developed through galvanic replacement reaction. As-prepared alloy nanoclusters indicate excellent selectivity and sensitivity for Pb2+. More... »

PAGES

695-701

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00604-014-1375-6

DOI

http://dx.doi.org/10.1007/s00604-014-1375-6

DIMENSIONS

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46 schema:description We report on the preparation of water-soluble and fluorescent silver/gold alloy nanoclusters (Ag/Au NCs) by a galvanic replacement reaction. The alloy NCs have an average diameter of 1.5 nm and are shown to be viable fluorescent probes for the determination of lead(II) due to aggregation-induced quenching of fluorescence. The alloy NCs are characterized in terms of photoluminescence spectrum, photoluminescence excitation spectrum, transmission electron microscopy and X-ray photoelectron spectroscopy which confirm the presence of alloy NCs. Bovine serum albumin, a well known stabilizing agent, has a high-affinity site for Pb2+ ion, and the resulting complex acts as a quencher of fluorescence. This finding has led to a method for selective determination of Pb2+ with a limit of detection of about 2 nM. Graphical AbstractA practical and robust synthesis of water-soluble and fluorescence active, small-size Ag/Au alloy nanoclusters are successfully developed through galvanic replacement reaction. As-prepared alloy nanoclusters indicate excellent selectivity and sensitivity for Pb2+. A practical and robust synthesis of water-soluble and fluorescence active, small-size Ag/Au alloy nanoclusters are successfully developed through galvanic replacement reaction. As-prepared alloy nanoclusters indicate excellent selectivity and sensitivity for Pb2+.
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