荧光
检出限
量子产额
镧
化学
分析化学(期刊)
碳纤维
掺杂剂
兴奋剂
猝灭(荧光)
发光
碳量子点
离子
量子点
无机化学
核化学
材料科学
纳米技术
色谱法
有机化学
光学
光电子学
复合数
复合材料
物理
作者
Qian Wang,Zhiqiang Wang,Zixuan Pu,Ying Wang,Mingtian Li
标识
DOI:10.1016/j.optmat.2023.113630
摘要
Based on the fluorescence quenching principle, a novel lanthanum-doped carbon quantum dots (La-CQDs) fluorescence probe was successfully developed for ion detection of Fe3+. La-CQDs with a fluorescence quantum yield of 29.93% was prepared in ethanol solution using ammonium citrate as the carbon source and lanthanum nitrate as the dopant. The luminescence performance of La-CQDs was enhanced by La doping and maintained over 90% of the maximum fluorescence intensity in different anions, water content and organic solvent environments. In the range of 25–200 μM, the fluorescence intensity of La-CQDs displayed a good linear relationship (Y = 0.00675X+ 1.07679, R2 = 0.9888) with the concentration of Fe3+ and its limit of detection (LOD) was calculated to be 6.78 μM. The method was successfully applied to the detection of Fe3+ in green tea and the measurement error was less than 3%. In addition, La-CQDs was developed for fluorescent colorimetric test paper and information anti-counterfeiting, while the fluorescence quenching effect was observed intuitively on the paper.
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