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Issue 16, 2018
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One-pot synthesis of highly fluorescent Fe2+-doped carbon dots for a dual-emissive nanohybrid for the detection of zinc ions and histidine

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Abstract

Metal ion-doping has been paid little attention for improving the fluorescence intensity of carbon dots (CDs) compared with nonmetallic-element doping. Herein, for the first time, Fe2+-doped CDs were facilely synthesized at 80 °C instead of by a hydrothermal method. Fe2+ was confirmed to be the only definitive common metal ion to synthesize highly fluorescent CDs with proline (Pro) as a carbon resource. The as-synthesized Fe2+-doped CDs showed bright blue fluorescence at 455 nm and exhibited favorable anti-ion, pH, and time stability. The blue cysteine-functional-Fe2+-doped CDs were combined with red gold nanoclusters (Au NCs) to construct a nanohybrid by electrostatic interaction for the ratiometric fluorescence sensing of Zn2+ and histidine (His), in which the CDs acted as a reference signal and the Au NCs as an analyte-responsive unit. The detection of Zn2+ and histidine (His) was shown by two distinct blue-pink and pink-blue-pink fluorescence color changes, respectively. Both of them showed excellent selectivity and sensitivity. Dual-emission fluorescent probes avoid the shortcomings of single fluorescence signals, which are susceptible to experimental conditions, and have a bright future being utilized for the visual detection of Zn2+ and His in practical analysis.

Graphical abstract: One-pot synthesis of highly fluorescent Fe2+-doped carbon dots for a dual-emissive nanohybrid for the detection of zinc ions and histidine

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Publication details

The article was received on 10 May 2018, accepted on 28 Jun 2018 and first published on 29 Jun 2018


Article type: Paper
DOI: 10.1039/C8NJ01858H
Citation: New J. Chem., 2018,42, 13651-13659

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    One-pot synthesis of highly fluorescent Fe2+-doped carbon dots for a dual-emissive nanohybrid for the detection of zinc ions and histidine

    B. Han, T. Peng, M. Yu, C. Chi, Y. Li, X. Hu and G. He, New J. Chem., 2018, 42, 13651
    DOI: 10.1039/C8NJ01858H

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