基于煤焦油沥青衍生的碳量子点的开-关-开纳米传感器用于检测 Cu、Fe 和 L-抗坏血酸。
On-off-on nanosensors of carbon quantum dots derived from coal tar pitch for the detection of Cu, Fe, and L-ascorbic acid.
机构信息
Institute of Chemical Engineering, University of Science and Technology Liaoning, Anshan, China; Key Laboratory of Chemical Metallurgy Liaoning Province', University of Science and Technology Liaoning, Anshan, China.
Institute of Chemical Engineering, University of Science and Technology Liaoning, Anshan, China; Key Laboratory of Chemical Metallurgy Liaoning Province', University of Science and Technology Liaoning, Anshan, China.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2021 Apr 5;250:119325. doi: 10.1016/j.saa.2020.119325. Epub 2020 Dec 14.
Novel nitrogen-doped carbon quantum dots (N-CQDs) were synthesized by a chemical oxidation method using medium-low temperature coal tar pitch as the raw material. Such quantum dots were developed as a highly sensitive fluorescent "on-off-on" switch sensor for the selective and simultaneous sensing of Cu and Fe. The as-prepared N-CQDs, which emit blue light, were characterized by TEM images, FT-IR spectra, Raman spectroscopy, XPS analysis, fluorescence spectra, and UV-vis absorption spectra. The results showed that the N-CQDs exhibit outstanding optical properties and high optical stability within the pH range of 4-10, with a quantum yield of approximately 7%. Additionally, the material performed as an "on-off" sensor which can be dramatically extinguished by Cu and Fe. A linear relationship between Cu and Fe ion concentration and fluorescence intensity was observed in the range from 0 to 50 μM. The limits of detection of the fluorescent sensor toward Cu and Fe were 0.16 μM and 0.173 μM, respectively. The Fe-quenched N-CQDs were restored after adding L-ascorbic acid, due to the redox reaction between Fe and L-ascorbic acid, which resulted in the detachment of Fe from the surface of the N-CQDs. The linear range for the detection of L-ascorbic acid was 0-28 μM. Therefore, the amount of L-ascorbic acid can be measured by using the sensing system consisting of Fe and N-CQDs. In consequence, N-CQDs are considered an important material for the detection of Cu and Fe in water samples or L-ascorbic acid in drugs.
新型氮掺杂碳量子点（N-CQDs）通过化学氧化法以中低温煤焦油沥青为原料合成。这些量子点被开发为一种高灵敏度的荧光“开-关-开”开关传感器，用于选择性和同时感测 Cu 和 Fe。所制备的发射蓝光的 N-CQDs 通过 TEM 图像、FT-IR 光谱、拉曼光谱、XPS 分析、荧光光谱和 UV-vis 吸收光谱进行了表征。结果表明，N-CQDs 在 pH 值为 4-10 的范围内表现出出色的光学性能和高光学稳定性，量子产率约为 7%。此外，该材料表现为“开-关”传感器，可被 Cu 和 Fe 显著熄灭。在 0 到 50 μM 的范围内观察到 Cu 和 Fe 离子浓度与荧光强度之间存在线性关系。荧光传感器对 Cu 和 Fe 的检测限分别为 0.16 μM 和 0.173 μM。加入抗坏血酸后，Fe 猝灭的 N-CQDs 得到恢复，这是由于 Fe 和抗坏血酸之间的氧化还原反应，导致 Fe 从 N-CQDs 表面脱离。检测抗坏血酸的线性范围为 0-28 μM。因此，可以通过使用由 Fe 和 N-CQDs 组成的传感系统来测量抗坏血酸的含量。因此，N-CQDs 被认为是检测水样中 Cu 和 Fe 或药物中抗坏血酸的重要材料。
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