Fluorescent sensor for selective determination of copper ion based on N-acetyl-L-cysteine capped CdHgSe quantum dots.
Fluorescent sensor for selective determination of copper ion based on N-acetyl-L-cysteine capped CdHgSe quantum dots.
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DOI：
10.1016/j.bios.2013.11.008
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发表时间：
2014-04
影响因子：
12.6
通讯作者：
Qingqing Wang;Xiangyang Yu;Guoqing Zhan;Chunya Li
中科院分区：
文献类型：
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作者：
Qingqing Wang;Xiangyang Yu;Guoqing Zhan;Chunya Li
以N-乙酰-L-半胱氨酸为稳定剂，采用简单的水相法合成了水分散性好、质量高、稳定性好的CdHgSe量子点。采用透射电子显微镜、X射线衍射光谱和红外光谱对所制备的N-乙酰基-L-半胱氨酸修饰的CdHgSe量子点进行了表征。以N-乙酰-L-半胱氨酸封端的CdHgSe量子点为荧光探针，研制了一种选择性测定铜离子的荧光传感器。N-乙酰基-L-半胱氨酸修饰的CdHgSe量子点与铜离子相互作用时，由于形成配位络合物和聚集体，荧光强度降低。该方法选择性好，不受Ag+、Zn ~（2+）、Co ~（2+）、Ni ~（2+）等干扰。在最佳条件下，铜离子浓度在1.0×10−9 ~ 4.0×10− 7 mol L−1范围内与荧光强度的变化呈线性关系，检出限为2.0×10− 10 mol L−1（S/N=3）。该方法已成功地应用于虾类和南湖水样中铜的测定，结果得到原子吸收光谱法的验证。该传感器具有选择性强、灵敏度高、操作简便等特点，具有良好的应用前景。
Using N-acetyl-l-cysteine as a stabilizer, well water-dispersed, high-quality and stable CdHgSe quantum dots were facilely synthesized via a simple aqueous phase method. The as-prepared N-acetyl-l-cysteine capped CdHgSe quantum dots were thoroughly characterized by transmission electron microscopy, X-ray diffraction spectroscopy and FTIR. A fluorescent sensor for selective determination of copper ions was developed using N-acetyl-l-cysteine capped CdHgSe quantum dots as fluorescent probe. The fluorescence intensity of N-acetyl-l-cysteine capped CdHgSe quantum dots decreased when interacted with copper ions due to the formation of coordination complex and aggregates. The method possesses high selectivity and is not influenced by some potential interferences such as Ag+, Zn2+, Co2+and Ni2+. Under the optimal conditions, the change of fluorescence intensity (ΔI) was linearly proportional to the concentration of copper ions in the range of 1.0×10−9–4.0×10−7mol L−1, with a detection limit as low as 2.0×10−10mol L−1(S/N=3). The developed method had been successfully employed to determine Cu2+in shrimp and South-lake water samples, and the results were verified by atomic absorption spectroscopy. The fluorescent sensor was demonstrated to be selective, sensitive and simple for copper ion determination, and promise for practical applications.