Zhu Ling, Shi Lujia, Tan Yiping, Zhang Huaiyin, Yin Jiacheng, Xu Chang, Wu Danlian, Ma Yunsu
Department of Pharmacy, The Affiliated Jiangyin Clinical College of Xuzhou Medical University Wuxi PR China.
School of Pharmacy, Xuzhou Medical University Xuzhou PR China
RSC Adv. 2022 Oct 21;12(46):30113-30119. doi: 10.1039/d2ra05167b. eCollection 2022 Oct 17.
In this study, a sensitive ratiometric fluorescent nanosensor was constructed using a facile one-pot method by encapsulating carbon dots (CDs) and cadmium telluride quantum dots (CdTe QDs) into the pore cavities of a metal-organic framework (ZIF-8). In this nanosensor (CD/CdTe QD@ZIF-8), the fluorescence attributed to CdTe QDs was quenched by silver ions (Ag), and the fluorescence intensity of CDs did not change. The introduction of ZIF-8 into the system can not only adsorb Ag but also easily separate CDs and CdTe QDs from the matrix. The developed CD/CdTe QD@ZIF-8 composite used as a ratiometric fluorescent probe exhibited high sensitivity and selectivity towards Ag. The working linear range was 0.1-20 μM with a limit of detection (LOD) of 1.49 nM. Finally, the proposed nanosensor was applied to determine Ag in lake water with satisfactory results.
在本研究中，通过一种简便的一锅法，将碳点（CDs）和碲化镉量子点（CdTe QDs）封装到金属有机框架（ZIF-8）的孔腔中，构建了一种灵敏的比率荧光纳米传感器。在这种纳米传感器（CD/CdTe QD@ZIF-8）中，碲化镉量子点的荧光被银离子（Ag）淬灭，而碳点的荧光强度不变。将ZIF-8引入该体系不仅可以吸附银离子，还能轻松地从基质中分离出碳点和碲化镉量子点。所制备的CD/CdTe QD@ZIF-8复合材料用作比率荧光探针，对银离子表现出高灵敏度和高选择性。工作线性范围为0.1 - 20 μM，检测限（LOD）为1.49 nM。最后，将所提出的纳米传感器应用于测定湖水中的银离子，结果令人满意。
