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Issue 12, 2016
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Silver nanoclusters as fluorescent nanosensors for selective and sensitive nitrite detection

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Abstract

As a highly carcinogenic pollutant but also an important food preservative, nitrite has attracted growing attention in the past few years. In this work, a hyperbranched polyethyleneimine protected silver nanocluster (hPEI-Ag NC) based nanosensor is proposed for the detection of nitrite. The sensing principle consists of two steps: nitrite reacts with hydrogen peroxide (H2O2) to generate peroxynitrous acid under acidic conditions, and the as-formed peroxynitrous acid then induces the aggregation and fluorescence quenching of hPEI-Ag NCs. Due to the specific nitrite–H2O2 chemistry, the hPEI-Ag NC based nanosensor shows high selectivity toward nitrite over other anions with a limit of detection of 100 nM. The practical application of the proposed nanosensor has been validated with lake water, tap water and seawater samples.

Graphical abstract: Silver nanoclusters as fluorescent nanosensors for selective and sensitive nitrite detection

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Article information


Submitted
22 Jan 2016
Accepted
21 Feb 2016
First published
23 Feb 2016

Anal. Methods, 2016,8, 2628-2633
Article type
Paper

Silver nanoclusters as fluorescent nanosensors for selective and sensitive nitrite detection

C. Chen, Z. Yuan, H. Chang, F. Lu, Z. Li and C. Lu, Anal. Methods, 2016, 8, 2628
DOI: 10.1039/C6AY00214E

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