Department of Process Engineering, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's A1C 5S7, Canada.
The Northern Region Persistent Organic Pollution Control (NRPOP) Laboratory, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's A1C 5S7, Canada.
Spectrochim Acta A Mol Biomol Spectrosc. 2023 May 5;292:122387. doi: 10.1016/j.saa.2023.122387. Epub 2023 Jan 20.
In this study, a fluorescent sensor of nitrogen-doped carbon quantum dots (N-CQDs) and silica gel hybrid was developed for the quantitative detection of nitenpyram, a toxic neonicotinoid existing in groundwater and/or surface water.The prepared N-CQDs@SiO sensor exhibited remarkable sensing selectivity and sensitivity towards nitenpyram among the four pesticides and six metal ions. A prominent fluorescence quenching of N-CQDs@SiO at 445 nm was observed in the presence of nitenpyram with a linear response range of 0-300.0 mg L and an estimated limit of detection of 1.53 mg L. The main cause for selective sensing is that nitenpyram absorbs the excitation light of N-CQDs@SiO, leading to fluorescence quenching of the sensor through the inner filter effect.
在这项研究中，开发了一种氮掺杂碳量子点（N-CQDs）和硅胶混合的荧光传感器，用于定量检测地下水中和/或地表水中存在的有毒新烟碱类杀虫剂——吡虫清。所制备的 N-CQDs@SiO 传感器在四种农药和六种金属离子中对吡虫清表现出显著的传感选择性和灵敏度。在存在吡虫清的情况下，N-CQDs@SiO 在 445nm 处表现出显著的荧光猝灭，线性响应范围为 0-300.0mg/L，估计检测限为 1.53mg/L。选择性传感的主要原因是吡虫清吸收了 N-CQDs@SiO 的激发光，通过内滤效应导致传感器的荧光猝灭。
