期刊
MICROCHIMICA ACTA
卷 183, 期 6, 页码 1899-1907出版社
SPRINGER WIEN
DOI: 10.1007/s00604-016-1819-2
关键词
Optical probe; Nanoprobe; Fluorescence; Quenching; Water analysis; Carbonization
资金
- Swinburne University of Technology Sarawak Campus through the Swinburne Sarawak Research Grant [2-5509]
- Direct For Education and Human Resources
- Division Of Human Resource Development [1438865] Funding Source: National Science Foundation
Carbon dots with yellow fluorescence (y-CDs) were synthesized from sucrose by acid carbonization with phosphoric acid as the dehydrating agent. Optimal yield was obtained by heating sucrose in concentrated phosphoric acid to 85 A degrees C for 30 min. The resulting y-CDs under the photo-excitation at 360 nm display an emission band peaking at 560 nm. The fluorescence is independent of pH values in the range from pH 4.0 to 11.4, and at ionic strengths of up to 4.7 M of potassium chloride. We also show that these y-CDs are viable fluorescent probes for the detection of chromium(III). At near neutral pH conditions, several metal ions quench the emission of the y-CDs, but under acidic conditions (pH 4), fluorescence is strongly affected by Cr(III) only. Quenching depends on the concentration of Cr(III) in the range up to 200 mu M, and the limit of detection is 24.6 mu M.
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