Hainan Provincial Key Laboratory of Quality and Safety for Tropical Fruits and Vegetables, Analysis and Test Center, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China.
Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China.
ACS Appl Mater Interfaces. 2021 Sep 8;13(35):41987-41996. doi: 10.1021/acsami.1c10074. Epub 2021 Aug 26.
Metal-organic frameworks (MOFs) prepared via typical procedures tend to exhibit issues like poor water stability and poor conductivity, which hinder their application in electrochemical sensing. Herein, we report a strategy for the preparation of mixed-valence ultrafine one-dimensional Ce-MOF nanowires based on a micelle-assisted biomimetic route and subsequent investigation into their growth mechanism. The prepared mixed-valence Ce-MOF nanowires exhibited a typical size of ∼50 nm and were found to present good water stability and high conductivity. On this basis, we examined the introduction of these nanowires into the luminol hydrogen peroxide luminescence system and proposed a novel dual-route self-circulating electrochemiluminescence (ECL) catalytic amplification mechanism. Finally, in combination with molecular imprinting, a MOF-based ECL sensor was developed for the detection of trace amounts of imidacloprid in plant-derived foods. This sensor exhibited a linearity of 2-120 nM and a detection limit of 0.34 nM. Thus, we proposed not only a novel route to MOF downsizing but also a facile and robust methodology for the design of a MOF-based molecular imprinting ECL sensor.
金属-有机骨架（MOFs）通过典型的方法制备往往表现出如差水稳定性和导电性差的问题，这阻碍了它们在电化学传感中的应用。在这里，我们报道了一种基于胶束辅助仿生途径制备混合价超精细一维 Ce-MOF 纳米线的策略，并对其生长机制进行了研究。所制备的混合价 Ce-MOF 纳米线表现出典型的尺寸约为 50nm，表现出良好的水稳定性和高导电性。在此基础上，我们考察了将这些纳米线引入到鲁米诺过氧化氢发光体系中，并提出了一种新的双途径自循环电化学发光（ECL）催化放大机制。最后，结合分子印迹，开发了一种基于 MOF 的 ECL 传感器用于检测植物源性食品中的微量吡虫啉。该传感器的线性范围为 2-120 nM，检测限为 0.34 nM。因此，我们不仅提出了一种 MOF 小型化的新途径，而且还提出了一种用于设计基于 MOF 的分子印迹 ECL 传感器的简便而强大的方法。
