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Issue 9, 2018
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Foxtail millet-derived highly fluorescent multi-heteroatom doped carbon quantum dots towards fluorescent inks and smart nanosensors for selective ion detection

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Abstract

Carbon quantum dots (CQDs) are attracting enormous attention as a smart material owing to their congenital virtues. Unfortunately, their low quantum yield (QY) and modest fluorescence stability seriously restrain their practically versatile applications. Herein, a facile yet green strategy has been developed for synthesizing nitrogen/sulfur/phosphrous (N/S/P) co-doped CQDs via hydrothermal treatment of natural foxtail millet without any extra additives or organic agents. The resultant N/S/P co-doped CQDs were endowed with remarkable excitation-dependent emission, high QY (∼21.2%), superior fluorescence stability, and long lifetime (∼2.05 ns) owing to multi-heteroatom doping. Thanks to their strong blue-green fluorescence upon irradiation with UV light (365 nm), the water-soluble CQDs demonstrated huge potential for anticounterfeit application as a fluorescent ink. When utilized as a fluorescent sensor for cation determination, the multi-heteroatom doped CQDs especially displayed the highest sensitivity and selectivity for Fe3+ along with good linear correlation ranging from 5 to 150 μM and a low detection limit of 0.046 μM. More remarkably, our fabricated high-quality CQDs would hold great promise in analytical and/or environmental fields.

Graphical abstract: Foxtail millet-derived highly fluorescent multi-heteroatom doped carbon quantum dots towards fluorescent inks and smart nanosensors for selective ion detection

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Publication details

The article was received on 06 Mar 2018, accepted on 06 Apr 2018 and first published on 07 Apr 2018


Article type: Paper
DOI: 10.1039/C8NJ01072B
Citation: New J. Chem., 2018,42, 7326-7331
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    Foxtail millet-derived highly fluorescent multi-heteroatom doped carbon quantum dots towards fluorescent inks and smart nanosensors for selective ion detection

    Z. Chen, Z. Zhao, Z. Wang, Y. Zhang, X. Sun, L. Hou and C. Yuan, New J. Chem., 2018, 42, 7326
    DOI: 10.1039/C8NJ01072B

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