中文摘要：本文以MoS2量子点为无标记荧光探针建立了一种可靠、简便、灵敏的玉米中甲基对硫磷农药残留检测方法，甲基对硫磷在碱性条件下水解形成对硝基苯酚，MoS2量子点纳米探针遇对硝基苯酚发光从而实现检测。最佳条件下，线性曲线范围为0.1-30μg/mL，检测限低至0.085μg/mL (S/N = 3)，该平台还成功地应用于玉米和自来水中甲基对硫磷农药残留检测，且获得了满意的结果。
外文摘要：A reliable, simple, and sensitive fluorescence method was developed for the determination of methyl parathion (MP) in rice using MoS2 quantum dots (QDs). Rapid hydrolysis of MP under alkaline conditions, and thus the formation of p-nitrophenol (p-NP) can be used for MP detection. The functional mechanism of the nanoprobe relies on p-nitrophenol-induced photoluminescence quenching of MoS2 QDs. The high probability of resonance energy transfer (RET) stems from the spectral overlap of MoS2 QD emission spectra and the absorption spectra of p-NP. The high value of the Stern-Volmer constant (K-SV = 3.73 +/- 104 M-1) suggests the efficient quenching of MoS2 QDs by MP in the course of the ET process. Under optimum conditions, a linear calibration curve was obtained for the range of 0.1 mu g mL(-1) to 30 mu g mL(-1) of MP with a detection limit as low as 0.085 mu g mL(-1) (S/N = 3). Furthermore, this platform allows the detection of MP in rice and tap water with satisfactory results.
外文关键词：LIQUID-LIQUID MICROEXTRACTION; FUNCTIONALIZED CARBON DOTS; SINGLE-LAYER MOS2; MOLYBDENUM-DISULFIDE; ORGANOPHOSPHORUS PESTICIDES; SENSITIVE DETECTION; GOLD NANOPARTICLES; FACILE SYNTHESIS; WATER SAMPLES; SENSOR
作者：Fahimi-Kashani, Nafiseh; Rashti, Ali; Hormozi-Nezhad, M. Reza; Mahdavi,Vahideh
作者单位：Sharif Univ Technol
期刊名称：ANALYTICAL METHODS
期刊影响因子：1.915
出版年份：2017
出版刊次：4
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