In this paper, a composite material (rGO/Ni/Co) was synthesized by a hydrothermal method and high temperature annealing, and used for the determination of dopamine (DA). Surface morphology and structure of the rGO/Ni/Co were characterized by Scanning electron microscope (SEM), Transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD). The effects of different pH, scanning rate and interfering substances on the electrochemical properties of dopamine were discussed. The electrochemical test results show that the rGO/Ni/Co/GCE electrode has excellent electrocatalytic activity for dopamine. Under the optimized conditions, the linear range of detection is 10 µmol/L-2250 µmol/L (r = 0.99837), the detection limit is 0.119 µmol/L, and the signal-to-noise ratio is 3. The interference test showed, that most of the ions did not show obvious influence on the detection of DA, indicating that the prepared electrode has selectivity for the detection of DA. Moreover, the composite has good magnetic properties and is convenient for sample separation and recovery.

本文采用水热法和高温退火法合成了复合材料（rGO / Ni / Co），用于多巴胺（DA）的测定。通过扫描电子显微镜（SEM），透射电子显微镜（TEM），傅立叶变换红外光谱（FTIR），X射线衍射（XRD）对rGO / Ni / Co的表面形貌和结构进行表征。讨论了不同pH，扫描速率和干扰物质对多巴胺电化学性能的影响。电化学测试结果表明，rGO / Ni / Co / GCE电极对多巴胺具有优异的电催化活性。在最佳条件下，线性检测范围为10 µmol / L-2250 µmol / L（r = 0.99837），检测极限为0.119 µmol / L，信噪比为3。干扰测试表明，大部分离子对DA的检测没有明显影响，表明制备的电极对DA的检测具有选择性。而且，该复合材料具有良好的磁性，并且便于样品分离和回收。