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Issue 7, 2017
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Rational designed strategy to dispel mutual interference of mercuric and ferric ions towards robust, pH-stable fluorescent carbon nanodots

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Abstract

As one of the most promising fluorometric nanosensors for metal ion sensing, carbon nanodots (C-dots) have developed rapidly in recent years. However, it is still a thorny problem to shield the mutual interference of two metal ions towards C-dots, e.g., Hg2+ and Fe3+ ions. In the present work, we propose rational routes for the unique interaction between C-dots and Hg2+ or Fe3+. The selectivity of the as-obtained label-free C-dots can be effectively switched by P3O105− and SCN. The resultant C-dots possess superior photoluminescence intensity stability in a wide pH range or in certain redox circumstances, which are highly preferred in terms of practical metal-ion detection. Moreover, the quenching–recovery–regeneration performances and quenching mechanisms were also investigated. Based on this stable and recoverable sensing platform, this in-depth study for dispelling interference from Hg2+ and Fe3+ ions may open up a new paradigm for developing potential detection of multi-metal ions using C-dots with switchable selectivity.

Graphical abstract: Rational designed strategy to dispel mutual interference of mercuric and ferric ions towards robust, pH-stable fluorescent carbon nanodots

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Publication details

The article was received on 06 Dec 2016, accepted on 09 Mar 2017 and first published on 09 Mar 2017


Article type: Paper
DOI: 10.1039/C6AN02601J
Citation: Analyst, 2017,142, 1149-1156
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    Rational designed strategy to dispel mutual interference of mercuric and ferric ions towards robust, pH-stable fluorescent carbon nanodots

    Y. Liu, Y. Liu, J. Lee, J. H. Lee, M. Park and H. Y. Kim, Analyst, 2017, 142, 1149
    DOI: 10.1039/C6AN02601J

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