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Issue 29, 2015
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Highly selective and sensitive nanoprobes for cyanide based on gold nanoclusters with red fluorescence emission

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Abstract

We report a novel and environmentally friendly fluorescent probe for detecting the cyanide ion (CN) using L-amino acid oxidase (LAAOx)-protected Au nanoclusters (LAAOx@AuNCs) with red emission. The fluorescence-based sensing behaviour of LAAOx@AuNCs towards anions was investigated in buffered aqueous media. Among the anions studied, CN was found to effectively quench the fluorescence emission of AuNCs based on CN induced Au core decomposition. Excellent sensitivity and selectivity toward the detection of CN in aqueous solution were observed. The CN detection limit was determined to be approximately 180 nM, which is 15 times lower than the maximum level (2700 nM) of CN in drinking water permitted by the World Health Organization (WHO). A linear relationship between the fluorescence intensity and CN concentration was observed in two ranges of CN concentration, including 3.2 × 10−6 to 3.4 × 10−5 mol L−1 and 3.81 × 10−5 to 1.04 × 10−4 mol L−1. The high sensitivity and selectivity to CN among the 17 types of anions make the AuNCs good candidates for use in fluorescent nanoprobes of CN.

Graphical abstract: Highly selective and sensitive nanoprobes for cyanide based on gold nanoclusters with red fluorescence emission

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Publication details

The article was received on 08 May 2015, accepted on 21 Jun 2015 and first published on 24 Jun 2015


Article type: Paper
DOI: 10.1039/C5NR03033A
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Citation: Nanoscale, 2015,7, 12666-12672

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    Highly selective and sensitive nanoprobes for cyanide based on gold nanoclusters with red fluorescence emission

    G. Zhang, Y. Qiao, T. Xu, C. Zhang, Y. Zhang, L. Shi, S. Shuang and C. Dong, Nanoscale, 2015, 7, 12666
    DOI: 10.1039/C5NR03033A

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