量子产额
荧光
水溶液
检出限
化学
猝灭(荧光)
碳纤维
光致发光
量子点
光化学
核化学
分析化学(期刊)
材料科学
纳米技术
物理化学
色谱法
光电子学
复合材料
物理
复合数
量子力学
作者
Yan Wu,Chengwei Zuo,Yujie Mou,Hao Wang,Yanbing Hou,Xiaodong Su,Zhenfu Jia,Qiu Hui-dong
出处
期刊:Analytical Methods
[The Royal Society of Chemistry]
日期:2023-01-01
卷期号:15 (42): 5607-5619
摘要
In this study, new red light-emitting carbon dots (R-CDs) that can selectively recognize Cr(VI) were prepared using a strategy that utilizes 2,4-diaminophenol to enhance the fluorescence of O-phenylenediamine based carbon dots. The results showed that 2,4-diaminophenol increased the quantum yield (QY) of the carbon quantum dots (CDs), and that the QY of the CDs increased from their original value of 8.7% to 20.1% (R-CDs). The R-CDs show sensitivity to acidic conditions and maintain good linearity between pH = 1.00-4.00, making them useful as pH probes. Furthermore, the prepared R-CDs possess good solubility in water and are responsive to changes in Cr(VI) concentrations in aqueous environments. The quenching of the R-CDs fluorescence was linearly correlated with the Cr(VI) concentration within a range of 0-20 μM, with a lower detection limit of 66 nM. The detection mechanism is attributed to the formation of hydrogen bonds between Cr(VI) and the R-CDs, resulting in the fluorescence quenching of the R-CDs. The R-CDs can be considered effective multifunctional fluorescent probes for both pH and Cr(VI) in aqueous environments. This study will provide new R-CD design strategies for probes that selectively identify specific target substances.
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