Analytical Division, Faculty of Chemistry, University of Mazandaran, 47416-95447 Babolsar, Iran.
Analytical Division, Faculty of Chemistry, University of Mazandaran, 47416-95447 Babolsar, Iran.
Mater Sci Eng C Mater Biol Appl. 2019 Dec;105:110058. doi: 10.1016/j.msec.2019.110058. Epub 2019 Aug 5.
In this work, a novel and highly fluorescent (FL) metal-organic framework (MOF)-based host-guest hybrid system was developed through encapsulation of polyethylene glycol (PEG)-capped ZnS quantum dots (QDs) into zeolitic imidazolate framework (ZIF)-67 at ambient temperature. This new composite material was characterized by FT-IR, XRD, TEM, UV-Vis absorption and FL spectroscopy, and then exploited as fluorescence sensor for highly sensitive and selective detection of Cu (II) ions in water samples. The as-prepared PEG-ZnS QDs@ZIF-67 nanohybrids took advantages of both accumulation effect in ZIF-67 and FL sensitivity and selectivity in ZnS QDs toward analyte-Cu. In this regard, ZIF-67 was treated as absorbents to capture and enrich Cu (II) ions, and ZnS QDs were exploited as tentacle to selectively and sensitively sense the bonding interactions between ZIF-67 and Cu (II) ions, and further transduce these chemical events to the detectable fluorescence signals. By this approach, Cu could be detected in a wide concentration range of 3 to 500 nM with a LOD as low as 0.96 nM. The proposed FL-sensor can be promising in the field of preparation of various QDs@MOFs platforms for application in high-performance optical sensing.
在这项工作中，通过在室温下将聚乙二醇（PEG）封端的 ZnS 量子点（QD）封装到沸石咪唑酯骨架（ZIF）-67 中，开发了一种新颖且高荧光（FL）的基于金属有机骨架（MOF）的主体-客体杂化系统。该新型复合材料通过傅里叶变换红外光谱（FT-IR）、X 射线衍射（XRD）、透射电子显微镜（TEM）、紫外-可见吸收光谱和荧光光谱进行了表征，然后被用作荧光传感器，用于在水样中对 Cu（II）离子进行高灵敏度和选择性检测。所制备的 PEG-ZnS QDs@ZIF-67 纳米杂化物利用 ZIF-67 中的积累效应和 ZnS QDs 对分析物-Cu 的 FL 灵敏度和选择性。在这方面，ZIF-67 被用作吸收剂来捕获和富集 Cu（II）离子，而 ZnS QDs 则被用作触角，以选择性和灵敏地感测 ZIF-67 和 Cu（II）离子之间的键合相互作用，并进一步将这些化学事件转化为可检测的荧光信号。通过这种方法，Cu 可以在 3 到 500 nM 的宽浓度范围内检测到，LOD 低至 0.96 nM。所提出的 FL 传感器有望在制备各种 QDs@MOFs 平台领域得到应用，以用于高性能光学传感。
