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Acid-assisted ultrasonic preparation of nitrogen-doped MXene quantum dots for the efficient fluorescence "off-on-off" detection of Zn(II) in water and oxalic acid in vegetables

文献类型： 外文期刊

作者： Yang, Jinwen 1 ; Chen, Linlin 2 ; Qi, Jie 2 ; Luo, Feili 1 ; Li, Lin 1 ; Wu, Honghong 2 ; Cao, Feifei 1 ; Gu, Jiangjiang 1 ;

作者机构： 1.Huazhong Agr Univ, Coll Sci, Wuhan 430070, Peoples R China

2.Huazhong Agr Univ, Coll Plant Sci & Technol, Ctr Crop Nanobiotechnol, Natl Key Lab Germplasm Innovat & Utilizat Hort Cro, Wuhan 430070, Peoples R China

3.Hubei Hongshan Lab, Wuhan 430070, Peoples R China

4.Huazhong Agr Univ, Shenzhen Inst Nutr & Hlth, Shenzhen 511464, Peoples R China

5.Chinese Acad Agr Sci, Agr Genom Inst Shenzhen, Genome Anal Lab, Shenzhen Branch,Guangdong Lab Lingnan Modern Agr,M, Shenzhen 511464, Peoples R China

关键词： MXene quantum dots; Ultrasonic synthesis; Fluorescence sensors; Zn(II); Oxalic acid; Food samples

期刊名称：FOOD CHEMISTRY （ 影响因子：8.8； 五年影响因子：8.6 ）

ISSN： 0308-8146

年卷期： 2024 年 430 卷

页码：

收录情况： SCI

摘要： A novel fluorescence "off-on-off" probe was presented to detect Zn(II) and oxalic acid (OA) based on nitrogendoped MXene quantum dots (N-MQDs), which were synthesized by an ultrasound approach at room temperature with nitric acid and ethylenediamine. These N-MQDs displayed small size (<10 nm), water dispersibility, and good photoluminescence. Furthermore, the N-MQDs showed an selective response towards Zn(II) through fluorescence enhancement, with a limit of detection (LOD) calculated as 0.127 & mu;M in the linear range of 0-20 & mu;M. Then, the fluorescence of N-MQDs/Zn(II) system could be selectively quenched after adding OA, with an effective response in the range from 0 to 20 & mu;M (LOD: 0.883 & mu;M). The fluorescence "turn-on" and "turn-off" properties of N-MQDs were resulted from the intramolecular charge transfer (ICT) of Zn(II) and the coordination between OA and Zn(II), respectively. This sensing platform was successfully applied for Zn(II) and OA detection in actual environmental and vegetable samples.

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