College of Chemistry & Materials Science, Shaanxi Provincial Key Laboratory of Electroanalytical Chemistry, Northwest University, Xi'an, 710127, Shaanxi, China.
College of Food Science and Engineering, Shaanxi Provincial Key Laboratory of Electroanalytical Chemistry, Northwest University, Xi'an, 710169, Shaanxi, China.
Mikrochim Acta. 2021 Dec 8;189(1):20. doi: 10.1007/s00604-021-05122-3.
Integrating other metal ions into mono-metallic metal-organic framework (MOF) to form bi-metallic MOF is an effective strategy to enhance the performance of MOFs from the internal structure. In this study, two-dimensional (2D) cobalt/zinc-porphyrin (Co/Zn-TCPP) MOF nanomaterials with different Co/Zn molar ratios were synthesised using a simple surfactant-assisted method, and novel dopamine (DA) sensing methods were constructed based on these materials. The characterisation results showed that all MOF with different Co/Zn molar ratios presented a nanofilm, and the Co and Zn elements were uniformly distributed. All sensors based on CoZn-TCPP had a certain catalytic performance to DA. Among them, the sensor based on COZn-TCPP showed the strongest signal response, indicating that the catalytic performance of MOF on DA can be adjusted by changing the Co/Zn molar ratio. The doping of metal ions improves the chemical environment of the pores, and increases the types and spatial arrangement of the active sites of the MOF, which is beneficial to the electron transfer and exchange with DA; Co and Zn active centres have a synergistic promotion effect, so the catalytic activity of MOF is significantly improved. The linear range at the potential of 0.1 V based on CoZn-TCPP for DA was 5 nM-177.8 μM, with a detection limit of 1.67 nM (S/N = 3). The sensor exhibited a good selectivity for detecting DA. This research is expected to provide new ideas and references for constructing high-performance sensing interfaces and platforms.
将其他金属离子整合到单核金属-有机骨架 (MOF) 中以形成双金属 MOF 是从内部结构增强 MOF 性能的有效策略。在这项研究中，使用简单的表面活性剂辅助方法合成了具有不同 Co/Zn 摩尔比的二维 (2D) 钴/锌卟啉 (Co/Zn-TCPP) MOF 纳米材料，并基于这些材料构建了新型多巴胺 (DA) 传感方法。表征结果表明，所有具有不同 Co/Zn 摩尔比的 MOF 均呈现出纳米薄膜形态，且 Co 和 Zn 元素均匀分布。所有基于 CoZn-TCPP 的传感器对 DA 均具有一定的催化性能。其中，基于 COZn-TCPP 的传感器表现出最强的信号响应，表明通过改变 Co/Zn 摩尔比可以调节 MOF 对 DA 的催化性能。金属离子的掺杂改善了孔的化学环境，并增加了 MOF 的活性位点的类型和空间排列，有利于与 DA 的电子转移和交换；Co 和 Zn 活性中心具有协同促进作用，因此 MOF 的催化活性得到显著提高。基于 CoZn-TCPP 的 DA 的 0.1 V 电位下的线性范围为 5 nM-177.8 μM，检测限为 1.67 nM (S/N = 3)。该传感器对 DA 的检测具有良好的选择性。这项研究有望为构建高性能传感界面和平台提供新的思路和参考。
