College of Pharmacy, Henan University of Chinese Medicine, Zhengzhou 450046, China.
Institute of Mass Spectrometer and Atmospheric Environment, Jinan University, Guangzhou 510632, China.
ACS Appl Mater Interfaces. 2023 Apr 19;15(15):18982-18991. doi: 10.1021/acsami.3c01204. Epub 2023 Apr 7.
The development of probes with sensitive and prompt detection of volatile organic compounds (VOCs) is of great importance for protecting human health and public security. Herein, we successfully prepared a series of bimetallic lanthanide metal-organic framework (Eu/Zr-UiO-66) by incorporating Eu for fluorescence sensing of VOCs (especially styrene and cyclohexanone) using a one-pot method. Based on the multiple fluorescence signal responses of Eu/Zr-UiO-66 toward styrene and cyclohexanone, a ratiometric fluorescence probe using (/) and (/) as output signals was developed to recognize styrene and cyclohexanone, respectively. Benefitting from the multiple fluorescence response, the limits of detection (LODs) of Eu/Zr-UiO-66 (1:9) for styrene and cyclohexanone were 1.5 and 2.5 ppm, respectively. These are among the lowest reported levels for MOF-based sensors, and this is the first known material for fluorescence sensing of cyclohexanone. Fluorescence quenching by styrene was mainly owing to the large electronegativity of styrene and fluorescence resonance energy transfer (FRET). However, FRET was accounted for fluorescence quenching by cyclohexanone. Moreover, Eu/Zr-UiO-66 (1:9) exhibited good anti-interference ability and recycling performance for styrene and cyclohexanone. More importantly, the visual recognition of styrene and EB vapor can be directly realized with the naked eyes using Eu/Zr-UiO-66 (1:9) test strips. This strategy provides a sensitive, selective, and reliable method for the visual sensing of styrene and cyclohexanone.
开发对挥发性有机化合物（VOCs）具有灵敏和快速检测能力的探针对于保护人类健康和公共安全具有重要意义。在此，我们通过在一锅法中掺入 Eu 成功制备了一系列双金属镧系金属有机骨架（Eu/Zr-UiO-66），用于使用荧光传感技术检测 VOCs（特别是苯乙烯和环己酮）。基于 Eu/Zr-UiO-66 对苯乙烯和环己酮的多重荧光信号响应，开发了一种比率荧光探针，分别使用（/）和（/）作为输出信号来识别苯乙烯和环己酮。受益于多重荧光响应，Eu/Zr-UiO-66（1:9）对苯乙烯和环己酮的检测限（LOD）分别为 1.5 和 2.5 ppm，这是基于 MOF 的传感器中报告的最低水平之一，并且这是首次报道的用于环己酮荧光传感的材料。苯乙烯的荧光猝灭主要归因于苯乙烯的较大电负性和荧光共振能量转移（FRET）。然而，FRET 解释了环己烷酮的荧光猝灭。此外，Eu/Zr-UiO-66（1:9）对苯乙烯和环己烷酮表现出良好的抗干扰能力和可重复使用性。更重要的是，Eu/Zr-UiO-66（1:9）试纸可以直接用肉眼实现对苯乙烯和 EB 蒸气的可视化识别。该策略为苯乙烯和环己烷酮的可视化传感提供了一种灵敏、选择性和可靠的方法。
