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Selective, Sensitive and Label-Free Detection of Fe3+ Ion in Tap Water Using Highly Fluorescent Graphene Quantum Dots

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Abstract

Graphene quantum dots (GQDs) as a new type of fluorescent carbon nanomaterials, showing excellent photoluminescence properties, biocompatibility, photoelectric properties, have become the current research focus. Iron element as an essential element in the human body and an important part of hemoglobin, is very important for human health, so the detection of ferric ions has great significance. In this paper, GQDs with strong blue light emission were prepared through pyrolysis treatment using citric acid as a carbon source. Through characterization by transmission electron microscopy (TEM) and fluorescence spectrometer, it was observed that the GQDs have a uniform particle size distribution and highly fluorescent intensity with a quantum yield of 27.4%. Due to the strong quenching effect of Fe3+ on GQDs fluorescence, GQDs was used as a green and facile fluorescence sensor to detect Fe3+ selectively and sensitively. The GQDs fluorescence sensor shows a sensitive response to Fe3+ in a wide linear range (3.5 × 10−6-6.7 × 10−4 M), a low detection limit of 1.6 μM (S/N = 3) and good selectivity. Importantly, the new sensor realizes the detection of Fe3+ ions in tap water because of its low detection limit, wide linear range, and high sensitivity.

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Acknowledgements

This work was supported in part by grants from the National Natural Foundation of China (11532004), Natural Science Key Foundation Project of CQ in China (CSTC2015JCYJBX0003).

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  1. Yuanyuan Zhang and Xiangyue Yang contributed equally in the article.

Authors and Affiliations

  1. Chongqing Key Laboratory of Nano/Micro Composite Materials and Devices, Chongqing University of Science and Technology, Chongqing, China

    Yuanyuan Zhang, Xiangyue Yang, Yunxun Pu, Wei Cheng, Song Lin, Zeyu Shao & Xiaoling Liao

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  1. Yuanyuan Zhang
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  2. Xiangyue Yang
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  7. Xiaoling Liao
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Correspondence to Xiaoling Liao.

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Zhang, Y., Yang, X., Pu, Y. et al. Selective, Sensitive and Label-Free Detection of Fe3+ Ion in Tap Water Using Highly Fluorescent Graphene Quantum Dots. J Fluoresc 29, 541–548 (2019). https://doi.org/10.1007/s10895-019-02365-5

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  • DOI: https://doi.org/10.1007/s10895-019-02365-5

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