荧光
量子产额
离子
二乙烯三胺
碳纤维
检出限
水溶液中的金属离子
材料科学
柠檬酸
分析化学(期刊)
量子点
猝灭(荧光)
化学
选择性
无机化学
核化学
光化学
纳米技术
催化作用
色谱法
物理
有机化学
量子力学
复合数
复合材料
作者
Yuanyuan Xiong,Mengxiao Chen,Zhen Mao,Yiqing Deng,Jing He,Huaixuan Mu,Peini Li,Wangcai Zou,Qiang Zhao
出处
期刊:Crystals
[Multidisciplinary Digital Publishing Institute]
日期:2023-05-13
卷期号:13 (5): 812-812
被引量:13
标识
DOI:10.3390/cryst13050812
摘要
Carbon dots have drawn extensive attention in the detection of metal ions with good stability, excellent biocompatibility and low toxicity. Meanwhile, the quantum yield, response rate and the detection mechanism for Cu2+ ions are vital to their development and application. To obtain more selective and sensitive materials to detect Cu2+ ions, N-doped carbon dots (DN-CDs) were synthesized by a one-step hydrothermal method using citric acid as the carbon source and diethylenetriamine (DETA) as the nitrogen source. The obtained DN-CDs exhibited stable and intense blue light emission and special near-infrared up-conversion fluorescence at 820 nm, attributed to the effect of introducing N atoms into the structure of carbon dots. Due to the dynamic quenching of the DN-CDs by Cu2+ ions, the fluorescence intensity (λex = 820 nm) of DN-CDs was quantitatively decreased in the presence of Cu2+ ions. The DN-CDs had a rapid response within 3 min. The DN-CD system exhibited a linear relationship with a concentration range from 2.5 to 50 µM and low detection limit (LOD) of 42 nM. After careful investigation, an interesting conclusion was proposed: N-doped CDs with N/O = 1:1 or higher with relatively abundant N atoms prefer to detect Cu2+ ions while those with N/O = 1:2 or lower prefer to detect Fe3+ ions.
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