Zheng Mingyu, Qian Xinmei, Li Chunxiang, Wang Jinglun, Huang Haowen, Deng Keqin
Key Laboratory of Theoretical Organic Chemistry and Function Molecule, Ministry of Education, Hunan University of Science and Technology, Xiangtan, 411201, People's Republic of China.
Hunan Province College Key Laboratory of Molecular Design and Green Chemistry, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China.
Mikrochim Acta. 2024 Jul 10;191(8):459. doi: 10.1007/s00604-024-06507-w.
A renewable electrochemical screen-printed electrode (SPE) is proposed based on magnetic bamboo-like nitrogen-carbon (N-C) nanotubes loaded with nickel-cobalt alloy (NiCo) nanoparticles (NiCo@N-CNTs) for the determination of ractopamine (RAC). During the preparation of NiCo@N-CNTs, Co-MOF-67 (ZIF-67) was firstly synthesized, and then blended with dicyandiamide and nickel acetate, followed by a one-step pyrolysis procedure to prepare NiCo@N-doped carbon nanotubes. The surface morphology, structure, and chemical composition of NiCo@N-CNTs were characterized by SEM, TEM, XRD, XPS, and EDS. The electrocatalytic and electrochemical behavior of NiCo@N-CNTs were investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results demonstrated that NiCo@N-CNTs possessed remarkable conductivity and electrocatalysis to the oxidation of ractopamine (RAC). By using screen-printed electrode (SPE), NiCo@N-CNTs, and a designed base support, a magnetic RAC sensor (NiCo@N-CNTs/SPE) was successfully constructed. It presented a detection linear range of 0.05-80 μM with a detection limit of 12 nM (S/N = 3). It also exhibited good sensitivity, reproducibility, and practicability in spiked real pork samples. Since the adhesion of NiCo/N-CNTs on SPE was controlled by magnet, the NiCo@N-CNTs was easily detached from the SPE surface by magnetism and thus displayed excellent renewability. This work broadened insights into portable devices for on-site and real-time analysis.
基于负载镍钴合金（NiCo）纳米颗粒的磁性竹状氮碳（N-C）纳米管（NiCo@N-CNTs），提出了一种可再生的电化学丝网印刷电极（SPE），用于测定莱克多巴胺（RAC）。在制备NiCo@N-CNTs的过程中，首先合成了Co-MOF-67（ZIF-67），然后将其与双氰胺和醋酸镍混合，接着通过一步热解程序制备NiCo@N掺杂碳纳米管。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）、X射线光电子能谱（XPS）和能谱分析（EDS）对NiCo@N-CNTs的表面形貌、结构和化学成分进行了表征。通过循环伏安法（CV）和电化学阻抗谱（EIS）研究了NiCo@N-CNTs的电催化和电化学行为。结果表明，NiCo@N-CNTs对莱克多巴胺（RAC）的氧化具有显著的导电性和电催化作用。利用丝网印刷电极（SPE）、NiCo@N-CNTs和设计的基底支撑体，成功构建了一种磁性RAC传感器（NiCo@N-CNTs/SPE）。它的检测线性范围为0.05 - 80 μM，检测限为12 nM（S/N = 3）。在加标的实际猪肉样品中也表现出良好的灵敏度、重现性和实用性。由于NiCo/N-CNTs在SPE上的附着是由磁体控制的，NiCo@N-CNTs很容易通过磁力从SPE表面分离，因此具有优异的可再生性。这项工作拓宽了对用于现场和实时分析的便携式设备的认识。
