College of Chemistry and Chemical Engineering, Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety, Central South University, Changsha 410083, China.
Hunan Institute of Food Quality Supervision Inspection and Research, The Hunan Provincial Key Laboratory of Food Safety Monitoring and Early Warning, Changsha 410111, Hunan, China.
Anal Methods. 2021 May 27;13(20):2338-2344. doi: 10.1039/d1ay00324k.
We herein report a facile and scalable strategy for the fabrication of a metal-organic framework (MOF) based composite by in situ growing ZIF-8 on gold nanoparticle (AuNP) loaded magnetic carbon nanotubes (mCNTs). AuNPs were firstly loaded on PEI (polyethylenimine) modified mCNTs by electrostatic forces, and then AuNPs/mCNTs were encapsulated into the ZIF-8 frame through in situ self-assembling of zinc ions and 2-methylimidazole. The morphology, spectroscopy and structural properties of the AuNP/mCNT@ZIF-8 nanocomposites were systematically characterized. The conductivity-strain tests revealed that the in situ insertion of AuNPs/mCNTs in ZIF-8 could not only shorten the electron transfer distance between active sites and mCNTs, but also increase the dispersion of mCNTs, which would benefit the electron and mass transfer. Besides, by adopting the AuNP/mCNT@ZIF-8 nanocomposite-modified glassy carbon electrode (GCE) as the working electrode, a novel electrochemical sensor was successfully developed for the detection of bisphenol A (BPA). A linear range of BPA detection from 1 μM to 100 μM with a limit of detection of 690 nM was favorably obtained. Moreover, the developed sensor exhibited satisfactory reproducibility and superior stability with excellent anti-interference ability, and was successfully applied in the detection of BPA in real samples.
我们在此报告了一种通过原位生长 ZIF-8 在负载金纳米粒子 (AuNP) 的磁性碳纳米管 (mCNT) 上制备金属有机骨架 (MOF) 复合材料的简便、可扩展策略。AuNP 首先通过静电力负载在 PEI（聚乙烯亚胺）改性 mCNT 上，然后通过锌离子和 2-甲基咪唑的原位自组装将 AuNP/mCNT 封装到 ZIF-8 框架中。AuNP/mCNT@ZIF-8 纳米复合材料的形貌、光谱和结构性质得到了系统的表征。导电-应变测试表明，原位插入 AuNP/mCNTs 到 ZIF-8 中不仅可以缩短活性位点和 mCNTs 之间的电子转移距离，还可以增加 mCNTs 的分散性，这有利于电子和质量的传递。此外，通过采用 AuNP/mCNT@ZIF-8 纳米复合材料修饰的玻碳电极 (GCE) 作为工作电极，成功地开发了一种用于检测双酚 A (BPA) 的新型电化学传感器。从 1 μM 到 100 μM 的 BPA 检测线性范围，检测限为 690 nM。此外，所开发的传感器表现出令人满意的重现性和优异的稳定性，具有出色的抗干扰能力，并成功应用于实际样品中 BPA 的检测。
