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A smartphone sensing fluorescent detection of mercury ion based on silicon quantum dots in environment water

文献类型： 外文期刊

作者： Zhang, Yuanxing 1 ; Ren, Dandan 2 ; Shi, Yongfu 1 ; Yuan, Rui 1 ; Ye, Hongli 1 ; Yin, Xue-Bo 4 ; Chi, Hai 1 ;

作者机构： 1.Chinese Acad Fishery Sci, East China Sea Fisheries Res Inst, Lab Aquat Prod Qual Safety & Proc, Key Lab Ocean & Polar Fisheries,Minist Agr & Rural, Shanghai 200090, Peoples R China

2.Dalian Ocean Univ, Coll Food Sci & Engn, Dalian 116023, Peoples R China

3.Minist Agr & Rural Affairs, Key Lab Control Safety & Qual Aquat Prod, Beijing 100141, Peoples R China

4.Shanghai Univ Engn Sci, Inst Frontier Med Technol, Coll Chem & Chem Engn, Shanghai 201620, Peoples R China

关键词： Silicon quantum dots; Detection; Mercury ion; Fluorescence; Smartphone; Environment water

期刊名称：SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY （ 影响因子：4.6； 五年影响因子：4.3 ）

ISSN： 1386-1425

年卷期： 2025 年 325 卷

页码：

收录情况： SCI

摘要： Mercury ion (Hg2+) pose a significant hazard to the natural environment. Conventional techniques like Inductively coupled plasma mass spectrometry, X-ray absorption spectroscopy, among others, pose some disadvantages as they demand a lot of money, need trained employees, and cannot provide on-site detection in real-time. A smartphone sensing technique based on silicon quantum dots (Si-QDs) was presented to detect Hg2+ in the environment without the usage of sophisticated equipment. Meanwhile, the technology was built by utilizing a smartphone to capture gray values of fluorescent images of the Si-QDs-Hg2+ system. Microwave-assisted Si-QDs with tiny particle size, high fluorescence, and good optical stability were created. The fluorescence of the Si-QDs was gradually quenched by raising the Hg2+ concentration from 0.5 mu mol/L to 5.0 mu mol/L for fluorescent detection with a detection limit of 28 nmol/L. The 94.8-97.1 % recovery demonstrated the viability of the Si-QDs approach for detecting Hg2+. Meanwhile, a smartphone sensing strategy was built by recording the gray value of the fluorescent images of the Si-QDs-Hg2+ systems using a smartphone, and the detection limit of the established approach was 3 nmol/L. The accuracy and reliability of the smartphone strategy were verified with the recovery rates of 80.3-92.5 % in tap water and 87.6-109 % in river water. Electron transfer quenching mechanism between Si-QDs and Hg2+ was evidenced by ultraviolet-visible spectroscopy, fluorescent decay curves, cyclic voltammetry, and Zeta potential. Finally, the suggested approach was used to detect Hg2+ in water samples from various environments.

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