首页|A paper-based visualization chip based on nitrogen-doped carbon quantum dots nanoprobe for Hg(II) detection

A paper-based visualization chip based on nitrogen-doped carbon quantum dots nanoprobe for Hg(II) detection

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  • NSTL
  • Elsevier
Hg(II) is one of the most toxic heavy metal ions. The bioconcentration and degradation-resistant of Hg(II) bring about serious harm to the ecosystem and humans. Therefore, the establishment of an accurate and effective method for detecting mercury ions is of great significance to environmental protection, food safety and human health. In this work, a new fluorescent nanoprobe was presented using nitrogendoped carbon quantum dots (N-CQDs) for Hg(II) sensing with high stability and selectivity. On this basis,a paper-based chip was innovatively developed for visualization detection of Hg(II). The N-CQDs were prepared through a one-step hydrothermal reaction using catechol and ethylenediamine as carbon and nitrogen sources, respectively. As-prepared N-CQDs exhibit the strong green fluorescence at the excitation/emission wavelength of 370/511 nm. In aqueous solution, a rapid and highly sensitive detection method of Hg(II) was established by the joint of dynamic and static quenching effect of Hg(II) on NCQDs fluorescence. Under the optimized conditions, there was a stable correlation between the fluorescence intensity change of N-CQDs and the concentrations of Hg(II) in the range of 15 ti 104 nM, and the detection limit was down to 8 nM (S/N = 3). The recoveries of water, sorghum and rice were 91.60 to 102.46%, which was consistent with ICP-MS. More importantly, the N-CQDs nanoprobe was further integrated in nitrocellulose membrane to develop paper-based chip for Hg(II) visualization detection, and the detection performance was also excellent. This strategy had significant implications for achieving lowcost, on-site real-time monitoring of mercury (II) in the environment and food. (c) 2021 Published by Elsevier B.V.

Mercury ionsFluorescence sensing detectionNitrogen doped carbon quantum dotsPaper-based visualization chipRATIOMETRIC FLUORESCENT DETECTIONMETAL-ORGANIC FRAMEWORKSSELECTIVE DETECTIONL-CYSTEINEGREEN SYNTHESISMERCURY IONSPROBEHG2+FACILEIODIDE

Zou, Chengyue、Liu, Zhenping、Wang, Xianfeng、Liu, Huan、Yang, Mei、Huo, Danqun、Hou, Changjun

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Chongqing Univ

2022

10.1016/j.saa.2021.120346

Spectrochimica acta

Spectrochimica acta

ISSN：1386-1425
年,卷(期)：2022.265
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