基于荧光 ZnSe 量子点的快速光学传感器用于识别水中爆炸物 2,4,6-TNP 痕迹。
Rapid optical sensor for recognition of explosive 2,4,6-TNP traces in water through fluorescent ZnSe quantum dots.
机构信息
Laser-Spectroscopy Laboratory, Department of Applied Physics, Delhi Technological University, Bawana Road, Delhi 110042, India.
Laser-Spectroscopy Laboratory, Department of Applied Physics, Delhi Technological University, Bawana Road, Delhi 110042, India.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2021 Nov 5;260:119937. doi: 10.1016/j.saa.2021.119937. Epub 2021 May 11.
In this report, blue fluorescent zinc selenide quantum dots (ZnSe QDs) were synthesized using 3-mercaptopropionic acid through a direct aqueous route at a lower temperature of 70 °C. The photoluminescence (PL) characteristics of ZnSe QDs have been employed to recognize nitroaromatic compounds, i.e., traces of 2,4,6-TNP (picric acid) in water. The sensing of nitroaromatic compounds was performed via fluorescence techniques. The PL band of ZnSe QDs observed at 490 nm is selectively quenched with an increasing concentration of picric acid in DI water and river water. For the proposed sensing probe, the Stern-Volmer (S-V) plot shows linearity over the range of 2.0 µM-0.25 mM with the detection limit of 12.4 × 10 M without any interference effect of other nitroaromatic compounds. The plausible mechanism of PL quenching is considered as the inner filter effect, based on absorption, PL and PL lifetimes.
在本报告中，通过直接水相法在 70°C 的较低温度下使用 3-巯基丙酸合成了蓝色荧光锌硒量子点 (ZnSe QDs)。ZnSe QDs 的光致发光 (PL) 特性被用于识别硝基芳香族化合物，即在水中痕量的 2,4,6-TNP（苦味酸）。通过荧光技术进行硝基芳香族化合物的检测。在 DI 水中和河水中，随着苦味酸浓度的增加，ZnSe QDs 在 490nm 处观察到的 PL 带被选择性猝灭。对于所提出的传感探针，Stern-Volmer（S-V）图在 2.0 µM-0.25 mM 的范围内显示出线性关系，检测限为 12.4×10 M，没有其他硝基芳香族化合物的干扰影响。基于吸收、PL 和 PL 寿命，PL 猝灭的可能机制被认为是内滤效应。
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