检出限
荧光
单宁酸
校准曲线
量子产额
材料科学
分析化学(期刊)
碳纤维
猝灭(荧光)
核化学
产量(工程)
氮气
化学
色谱法
有机化学
光学
复合数
物理
复合材料
冶金
作者
Huan Yang,He Li,Shuang Pan,Hui Liu,Xiaoli Hu
标识
DOI:10.1016/j.saa.2018.11.029
摘要
Herein, a facile approach for highly sensitive and selective detection of tannic acid (TA) was proposed with the nitrogen-doped fluorescent carbon dots (NCDs) as a novel fluorescent probe, using sodium citrate and aminopyrazine as precursors. The as-synthesized NCDs exhibited multiple advantages including high quantum yield (11.8%), good water solubility and satisfactory stability. In addition, the NCDs displayed excitation-independent emission behavior with fluorescence emission peak remaining at 389 nm under excitation of 270–350 nm. Significantly, the fluorescence quenching of as-fabricated NCDs was observed with the increasing TA concentration, and the calibration curve displayed a wide linear region ranging from 0.40 to 9.0 μmol L−1 with a detection limit of 0.12 μmol L−1. This fluorescent probe also performed well in determining TA in beer samples with average recoveries of TA ranging from 96.1% to 104.4% and the relative standard deviation less than 5%, which provided a reliable, rapid and simple method to determine TA in real samples. Thus, this method offered a valuable insight for its practical applications.
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