期刊
MICROCHIMICA ACTA
卷 185, 期 2, 页码 -出版社
SPRINGER WIEN
DOI: 10.1007/s00604-017-2619-z
关键词
Nanoparticles; Nitrogen and sulfur co-doped; Luminescence; Excitation independent; Fluorescence quantum yields; Fluorescence quenching; Electron transfer; Water analysis; Antibiotic drug
资金
- Ministry of Science and Technology of Jilin Province, China [20150204070GX]
Uniform N- and S-co-doped carbon dots (NSCDs) with fluorescence quantum yields of up to 64% were synthesized via a one-step microwave-assisted method. Ammonium citrate and L-cysteine act as precursors, and synthesis is completed in 2.5 min using a 750 W microwave oven to give a 62% yield. The NSCDs show bright blue fluorescence (with excitation/emission peaks at 353/426 nm) and have narrow size distribution. On exposure to levofloxacin (LEV), the emission maximum shifts to 499 nm. This effect was used to design ratiometric (2-wavelength) assays for LEV. The fluorometric method (based on measurement of the fluorescence intensity ratio at 499 and 426 nm) has a detection limit of 5.1 mu g.L-1 (3 sigma/k) and a linear range that extends from 0.01 to 70 mg.L-1. The method was applied to the determination of LEV in three kinds of spiked water samples and has recoveries in the range from 98.6 to 106.8%. The fluorescent probe described here is highly selective and sensitive.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据