Quantum dots immobilized paper for specific and sensitive quantitation of Ni(II) by headspace photochemical vapor generation: Mechanism and application for RGB detection in tea fusion with a smartphone

检出限 量子点 荧光 光化学 碲化镉光电 化学 分析化学(期刊) 甲酸 吸光度 X射线光电子能谱 猝灭(荧光) 纳米技术 材料科学 色谱法 化学工程 物理 光学 工程类
作者
Xin Yuan,Jiahui Zhang,Haiyan Yang,Qing Yang,Laicai Li,Mei Zhang,Ke Huang
出处
期刊:Sensors and Actuators B-chemical [Elsevier BV]
卷期号:372: 132686-132686 被引量:21
标识
DOI:10.1016/j.snb.2022.132686
摘要

To avoid the interferences of coexisting ions from sample matrixes during CdTe quantum dots (QDs) based fluorescence and colorimetric assay, an instrument-free paper-based analytical device immobilized CdTe QDs was developed for specific and sensitive quantitation of Ni(II) by headspace photochemical vapor generation (HS-PVG). In the PVG procedure, Ni(II) was converted to volatile Ni(CO) 4 by reacting with formic acid under ultraviolet light irradiation, which can effectively quench the fluorescence of the CdTe QDs coated paper. The quenching mechanism was studied in depth via both experimental and theoretical investigations. The results of X-Ray diffraction, X-ray photoelectron spectroscopy, and density functional theory (DFT) show that the generated Ni(CO) 4 was reacted with O 2 to decompose into NiO at room temperature, which was deposited on the surface of CdTe QDs coated paper, causing its fluorescence quenching. Moreover, visual detection of Ni(II) was achieved with a smartphone by identifying the RGB value of QDs coated paper via HS-PVG procedure. A limit of detection (LOD) of 6.2 μg L −1 was required, which can match those obtained by other large-scale instruments. The concentration of Ni(II) in a series of tea infusions was accurately detected with different leaching experiments and soaking conditions. • A paper-based analytical device is developed for Ni(II) detection with a smartphone. • Headspace photochemical vapor generation was firstly used to greatly avoid the interferences • Quenching mechanism was studied via both experimental and theoretical investigations. • This system revealed good performance and μg L -1 level LOD could be obtained via RGB assay. • The Ni(II) in tea infusions with different soaking conditions was accurately detected
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