2,4,6-Trinitrophenol detection by a new portable sensing gadget using carbon dots as a fluorescent probe
2,4,6-Trinitrophenol detection by a new portable sensing gadget using carbon dots as a fluorescent probe
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使用碳点作为荧光探针的新型便携式传感装置检测 2,4,6-三硝基苯酚
DOI：
10.1007/s00216-019-01670-z
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发表时间：
2019-04-01
影响因子：
4.3
通讯作者：
Huang, Chengzhi
中科院分区：
文献类型：
--
作者：
Chen, Bin;Chai, Shuiqin;Huang, Chengzhi
研制了一种基于碳量子点（CD）荧光的光学传感装置，实现了对自来水和湖水中2，4，6-三硝基苯酚（TNP）的现场检测。通过一步水热合成路线制备了荧光CD。荧光光谱表明，在水介质中，该环糊精能特异性地将TNP与其他硝基芳香族炸药区分开来。荧光猝灭与TNP浓度在1 ~ 100 μM范围内呈线性关系，检测限为0.48 μM（3σ/k）。其检测机理是内过滤效应和电子转移的协同作用。此外，还开发了基于高精度RGB颜色传感器和微控制单元的便携式传感装置。利用该传感器和光盘，实现了自来水和湖水样品中TNP的检测。重要的是，便携式传感装置与高稳定性，低毒性和敏感的CD相结合，可能具有很大的应用潜力，在广泛的现场传感情况。以4-二乙氨基水杨醛为起始原料合成碳量子点，用于2，4，6-三硝基苯酚（TNP）的检测。TNP对碳量子点的荧光有猝灭作用，其猝灭机理是内过滤效应和电子转移的协同作用。基于32位微控制器的便携式传感器已成功应用于现场TNP检测。
An optical sensing gadget using fluorescence of carbon dots (CDs) was developed to realize the in-field detection of 2,4,6-trinitrophenol (TNP) in tap water and lake water samples. Fluorescent CDs were prepared through a one-step hydrothermal synthetic route. The fluorescence spectra demonstrated that the CDs could specifically discriminate TNP from other nitroaromatic explosives in an aqueous medium. The fluorescence of the CDs was quenched linearly with the concentration of TNP in the range from 1 to 100 μM, with a detection limit of 0.48 μM (3σ/k). The detection mechanism was ascribed to the synergistic effect of the inner filter effect and electron transfer. In addition, a portable sensing gadget based on a high-precision RGB color sensor and a micro control unit was developed. With use of the sensing gadget and the CDs, TNP detection in tap water and lake water samples was realized. Importantly, the portable sensing gadget combined with highly stable, low-toxicity, and sensitive CDs might have great potential for application in extensive in-field sensing situations. Graphical abstract Carbon dots synthesized with 4-(diethylamino)salicylaldehyde as the initial material were used for 2,4,6-trinitrophenol (TNP) detection. TNP quenches the fluorescence of carbon dots, and the mechanism is ascribed to the synergistic effect of the inner filter effect and electron transfer. A portable sensing gadget based on a 32-bit micro control unit was successfully applied for in-field TNP detection.