Journal
MICROCHIMICA ACTA
Volume 185, Issue 2, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-017-2619-z
Keywords
Nanoparticles; Nitrogen and sulfur co-doped; Luminescence; Excitation independent; Fluorescence quantum yields; Fluorescence quenching; Electron transfer; Water analysis; Antibiotic drug
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Funding
- Ministry of Science and Technology of Jilin Province, China [20150204070GX]
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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.
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