College of Chemistry, Jilin University, Changchun, 130012, Jilin, China.
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, Jilin, China.
Anal Bioanal Chem. 2018 Jul;410(18):4301-4309. doi: 10.1007/s00216-018-1079-6. Epub 2018 Apr 30.
Highly selective nitrogen-doped carbon quantum dots (ND-CQDs) for copper ion (Cu) determination were synthesized by a solvent-free pyrolysis of citric acid and histidine. The resultant ND-CQDs display a stable bright blue fluorescence with a satisfactory product yield of 56% and quantum yield of 16%. The ND-CQDs not only show good photostability under continuous UV irradiation, but are also dramatically stable against extreme ionic strengths. The solid powders of the ND-CQDs re-dispersed in water still maintain a strong blue fluorescence after storing at room temperature for 6 months. The ND-CQDs can be employed to selectively detect Cu in a wide linear range of 0.6-30 μM. The detection limit is as low as 0.19 μM. The ND-CQDs were applied for Cu detection in environmental water samples, fruit juice samples, and urine sample. Satisfactory recoveries of 96-102% with relative standard deviations below 3% were obtained. The research provided a promising prospect for selective detection of Cu in the complex matrix. Graphical abstract Schematic illustration of the preparation of the ND-CQDs and its detection mechanism to Cu.
通过柠檬酸和组氨酸的无溶剂热解合成了用于铜离子 (Cu) 测定的高选择性氮掺杂碳量子点 (ND-CQDs)。所得 ND-CQDs 显示出稳定的亮蓝色荧光，产率为 56%，量子产率为 16%。ND-CQDs 不仅在连续紫外照射下表现出良好的光稳定性，而且对极端离子强度也具有显著的稳定性。ND-CQDs 的固体粉末在室温下储存 6 个月后重新分散在水中仍保持强蓝色荧光。ND-CQDs 可用于在 0.6-30 μM 的宽线性范围内选择性检测 Cu。检测限低至 0.19 μM。ND-CQDs 用于环境水样、果汁样品和尿液样品中的 Cu 检测。获得了 96-102%的回收率和低于 3%的相对标准偏差。该研究为复杂基质中 Cu 的选择性检测提供了有前途的前景。
