College of Chemistry, Changchun Normal University, Changchun, 130032, People's Republic of China.
Mikrochim Acta. 2022 Jul 28;189(8):298. doi: 10.1007/s00604-022-05398-z.
A novel solid-state electrochemiluminescence (ECL) sensor for chlorpyrifos (CPF) detection was constructed based on zeolitic imidazolate framework-67 electrospinning nanofibers (ZIF-67 NFs). Silver nanoparticles (Ag NPs), ZIF-67 NFs, tris(2,2'-bipyridyl) ruthenium(II) [Ru(bpy)], and Nafion were successively deposited on the surface of the electrode. Ag NPs played a role in promoting electron transfer, and ZIF-67 NFs played a role in fixing Ru(bpy) and promoting electron transfer due to its large specific surface area and porosity. Nafion formed a film on the outermost layer of the electrode to further improve the stability of the system. Therefore, the modified electrode showed stable and obvious ECL signal in PBS solution containing 10 μL 0.01 M TprA (pH 8.0). CPF quenched the ECL signal of the system, and the quenching value was linear with the logarithm of CPF concentration in the range 1.0 × 10 to 1.0 × 10 M. The detection limit was 3.3 × 10 M (S/N = 3). In this study, ZIF-67 NFs were used as an ECL promoter for the first time, broadening the application range of ZIF-67 NFs.
基于沸石咪唑酯骨架-67 电纺纳米纤维 (ZIF-67 NFs)，构建了一种用于检测毒死蜱 (CPF) 的新型固态电致化学发光 (ECL) 传感器。银纳米粒子 (Ag NPs)、ZIF-67 NFs、三(2,2'-联吡啶)钌(II) [Ru(bpy)] 和 Nafion 依次沉积在电极表面。Ag NPs 促进了电子转移，而 ZIF-67 NFs 由于其较大的比表面积和孔隙率，起到了固定 Ru(bpy) 和促进电子转移的作用。Nafion 在电极的最外层形成一层膜，进一步提高了系统的稳定性。因此，在含有 10 μL 0.01 M TprA（pH 8.0）的 PBS 溶液中，修饰后的电极显示出稳定且明显的 ECL 信号。CPF 猝灭了该体系的 ECL 信号，其猝灭值与 CPF 浓度的对数在 1.0×10 到 1.0×10 M 的范围内呈线性关系。检测限为 3.3×10 M（S/N=3）。在本研究中，首次将 ZIF-67 NFs 用作 ECL 促进剂，拓宽了 ZIF-67 NFs 的应用范围。
