Mechanism of fluorescent quenching in ship fuel nitrogen content detection using Nb-doped SnO2 quantum dots as the fluorescent probe.
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| Title: | Mechanism of fluorescent quenching in ship fuel nitrogen content detection using Nb-doped SnO2 quantum dots as the fluorescent probe. |
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| Authors: | Fu, Ce1 (AUTHOR), Feng, Xiaoying1 (AUTHOR), Tian, Haoze1 (AUTHOR), Zhang, Yanan1 (AUTHOR), Zhai, Zhaoxia1 (AUTHOR), Qiu, Peilun1 (AUTHOR), Hu, Chuqiao1 (AUTHOR), Liu, Jianqiao1 (AUTHOR) jqliu@dlmu.edu.cn, Wang, Junsheng1 (AUTHOR) wangjsh@dlmu.edu.cn |
| Source: | Applied Surface Science. Sep2025, Vol. 702, pN.PAG-N.PAG. 1p. |
| Subjects: | Photoinduced electron transfer, Stannic oxide, Fluorescence quenching, Ship fuel, Energy transfer, Quantum dots |
| Abstract: | [Display omitted] • Nb is uniformly incorporated into the lattice without causing distortion. • Nb enhanced charge transfer and adsorption energies of –NH 2. • Excellent performance with R2 = 0.99512 and LOD = 0.011 %m/m. • Fluorescent quenching mechanism is photoinduced electron transfer. The mechanism of fluorescence variation in quantum dots (QDs) is crucial for the performance of fluorescence probes. However, the complex mechanisms involved in QDs make the accurate detection of ship fuel nitrogen content (FNC) to mitigate combustion emission pollution a challenging task. Herein, we demonstrate that Nb doping-induced band structure modulation can alter the electronic and optical properties of SnO 2 QDs, and use the fluorescence quenching effect to explain the mechanism for detecting FNC. In this study, we established a low-cost, simple-to-operate, high-accuracy, and low-detection-limit method for detecting FNC, based on the fluorescence quenching phenomenon of Nb-SnO 2 QDs. The method has a linear range of 0.51 % m/m to 0.66 % m/m, a detection limit of 0.011 % m/m, R2 = 0.99512, and a recovery rate ranging from 95.79 % to 102.2 %. Density functional theory (DFT) calculations were used to analyze the adsorption structures of four typical functional groups –NH 2 , −SH, –COOH, and –OH on the Nb-SnO 2 (110) surface, revealing the adsorption energy and charge transfer during the detection process. It was found that Nb doping enhances the adsorption capability of SnO 2 QDs for –NH 2. Finally, the fluorescence quenching mechanism was determined to be the photoinduced electron transfer (PET). This mechanism provides important insights for the subsequent doping modulation of QDs' band structure and optical properties, as well as for the development of other fluorescence probes. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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